All Products

Part Number: 34L-99-40

08080-76 Stainless Steel Bimetal Pocket Thermometer, 1" Dial, Poly Lens, 8" Stem, -40-160F, 2F Div by Digi-Sense

• Factory tested to three points with a ±1% accuracy
• Minimum immersion: liquids 2" (50 mm), gases 4" (100 mm)
• Hermetically sealed dial stops internal fogging
• Recalibrate using external adjustment nut
• 304 Stainless Steel dial case and stem
• Shock resistant

Includes

All thermometers come with a statement of test, and a plastic storage sleeve with pocket clip

GHS1205 Workplace Thermal Transfer Labels, Red Border (4" x 6") by GHS Safety

Need an open format label for your HazCom GHS requirements? Try generic HazCom GHS label system. Labels are Thermal Transfer paper with a permanent adhesive and can be hand printed or used in any standard Thermal Transfer printer. Use any standard desktop publishing package to quickly make your own Professional looking labels.

Enhance the label with Hazard Class and Personal Protective Equipment labels (sold separately).

Labels sold by the roll. 500 labels per roll

*Please note we can only ship RKI products to customers within the United States

G999P-03-03-00-00-70-61-11K G999 Multi-gas Atmospheric Monitor Value Kit, 5 year O2 (lead free), 3 year COSH, PID (0-2,000 ppm), IR LEL with ISM 915 MHz RF wireless, includes calibration cap, cable, charging cradle, wall power adapter, integrated pump, sample probe and tubing by GfG

The Microtector III G999 combines the demands of a modern multi-gas measurement device for protecting workers with the ability to safely measure confined spaces. As a robust and sophisticated multi-gas detector, it is versatile in its application and flexible in sensor combinations.

Advantages

Safety through quality and functionality

To fit every environment, there are three versions available. All versions include three electrochemical and one infrared sensor. Depending on the version, the G999 features a catalytic combustion (CC) sensor, a combined CC/semiconductor sensor, a PID sensor or a fourth electrochemical sensor. This allows a variety of gas combinations or measuring ranges to be defined and simultaneously monitored.

The well thought-out design of the housing and the menu navigation, allows for easy operation in difficult situations. For example, the display can be easily rotated 180°, so that it is always easy to read. For work in poorly lit rooms or in emergency situations, the G999 features an explosion-proof LED torch.

Designed for difficult working conditions

The Microtector III G999 is certified for use in Ex Zone 0 and is water and dust-proof according to protection class IP 67 and is suitable for challenging applications. The rubberized polycarbonate housing provides excellent protection against jolts and impacts, while the practical design and robust crocodile clip ensure optimum wearing comfort.

Ample Battery Power for Long Operating Times

Unlike other devices, the G999 features a double battery capacity of up to 130 hours of operation and provides power supply to the pump.

Remote Monitoring to Protect Employees

If devices with radio modules are used, teams can be monitored centrally via the portable GfG-Link or using a computer and USB dongle. Information regarding the measured gas concentrations, alarms and the status of the man-down alarm will then be available in real time.

Prepared for an Emergency - Alarm for Exercise

In the event of an alarm, knowing how to behave is highly important. By means of the alarm simulation any gas values can be transmitted to the Microtector III G999 to simulate and train different emergency scenarios.

Maintenance & Documentation – Location-Independent and Legally Compliant

The test and docking stations for the Microtector III G999 not only allow location-independent, daily display tests and regular functional checks, but also the complete documentation.

G888 – The Perfect Match

It is not always necessary to equip every employee with a gas detector including a pump for safe measurement of confined spaces, but everyone should have a modern multi-gas detector. In such situations the Microtector III G888 is recommended. Like the G999, it offers optimum individual protection for all those who have to work in hazardous areas and/or enclosed spaces.

*Please note we can only ship RKI products to customers within the United States

DO1200/T DO1200 Dissolved Oxygen Sensor, Galvanic, 12mm, Hand Held, PTFE Membrane by Sensorex

The DO1200 and DO1200TC feature dependable galvanic technology. No warm up period is required. Sensors are supplied with fast responding HDPE membrane caps for portable or lab use. Optional PTFE membrane caps are available for on-line or heavy UV exposure applications. Fill solution is replaceable when required.

The DO1200 is supplied without internal temperature compensation. The DO1200TC can be supplied with a variety of user defined ATC elements. Standard cable length is 2.5 feet with a tinned lead termination. Longer cable lengths and connectors are available for an additional charge. For on-line use, our FC75P 3/4 inch in-line fitting may be ordered to provide for mounting into 3/4 inch FNPT threaded tees.

Features

• Reliable galvanic sensing technology
• Compact 12mm design
• For portable, laboratory or on-line use
• Optional integral ATC element
• Easy to use pre-membraned replacement caps

XNX-AMAV-MNIC1 XNX Universal Transmitter, ATEX M25 AL MDBS MPD IR CO2 VV by Honeywell Analytics

XNX Universal Transmitter, ATEX M25 AL FF HRT FOR TOX/O2 SNSRThe XNX Universal Transmitter, now with HART EDDL, marks a new turn in gas detection from Honeywell Analytics. It supports the widest range of sensors on a common platform and offers a modular choice of inputs and outputs.

XNX is designed for flexible integration, simple installation, user-friendly operation and straight-forward maintenance. It is ideal for use with a range of gas monitoring controllers or industry standard PLCs. The introduction of our HART Enhanced Device Descriptor Language (EDDL) software provides users with an at-a-glance indication of the health of their gas detectors in the field.

Bringing together the best solutions in gas detection

Electrochemical

• Proven electrochemical sensing technology
• Surecell™ electrochemical cells are ideal for hot and humid environments
• Long life sensing cells (typical >2 years)
• Patented 'Reflex' sensing element verification diagnostics
• Sensor recognition software auto configures transmitter
• Plug and play factory configured sensors
• Intrinsically safe sensor connection permits hot swap, reducing down time

Catalytic Bead

• Supports Honeywell Analytics 705, 705HT, Sensepoint, Sensepoint HT and MPD sensors
• Fast response to wide range of hydrocarbons and flammables

Infrared (Open Path IR, Point IR, IR Cell)

• Supports Honeywell Analytics Searchline Excel, Searchpoint Optima Plus
• Failsafe operation
• Fast speed of response
• Reduced routine maintenance
• Immune to catalytic poisons
• Long operating life
• Works in inert atmospheres

High performance

• Flammable gas detection 0 to 100% LFL/LEL
• Point IR with heated optics provides immunity to poisoning and no hidden faults
• Open-path IR flammable gas detection in LEL-m measurement
• Electrochemical cell offers toxic gas detection in ppm
• IR cell provides CO₂ and combustible gas monitoring
• Robust and reliable operation in explosive areas and harsh environments

Flexible Operation

• 3 versions - supports (Catalytic Bead and IR Cell), Electrochemical Cell and IR (point and open-path) gas detection
• Multi-Purpose Detector (MPD) with field serviceable mV, Catalytic bead and IR Cell capability
• 4-20mA with HART® as standard
• HART Enhanced Device Description Language (EDDL) software*
• Multiple communications options include up to 3 relays, MODBUS® and FOUNDATION® H1 Fieldbus
• Optional local IS port for handheld HART configurator

Easy to Use

• Large, backlit, easy-to-view LCD display offers multisensory indicators (visual icons, colored buttons, text, etc.) to display gas and sensor readings
• User interface supported by 8 selectable languages (English, Spanish, German, Italian, Portuguese, French, Russian, Chinese)
• Self-test and fault indication features
• Non-intrusive, one-man operation
• Quick calibration with auto-inhibit

Easy to Install

• 3 or 4 wire operation, source, sink or isolated
• Simple plug-in sensors and replaceable cells
• NEMA 4X IP66 rated for rugged indoor/outdoor use
• Five conduit entries for ease of installation

Cost Effective

• Minimal training required
• One-man operation
• Plug-in sensor replacement
• All necessary accessories included

725-111-03 Eagle 2 Portable Monitor for LEL & PPM H2 (Catalytic)/CH4 (100% LEL/100% Volume (IR) Autoranging)/O2/H2S/CO2 5% Volume (IR) by RKI Instruments

Continuing in its legacy of durable and reliable gas detection and monitoring systems, RKI Instruments is proud to offer a new product in its popular Eagle portable gas detector series. The Eagle 2 can monitor up to 6 different gases and is equipped with several exclusive features that can only be found with the Eagle series. In addition, its large glove friendly push buttons and LCD screen ensure an ease of use when onsite. Rated intrinsically safe, the Eagle 2 is equipped with state of the art technologies that are not available with other competitive gas detectors and monitors.

Specialty Sensors

The Eagle 2 has a variety of available specialty sensors. Workers can use a photoionization detector for low or high range VOC detection and Fence Electrode Technology for humidity and contamination resistance. An infrared sensor is available for Co2, % LEL CH4, % Volume CH4, % LEL HC, and % Volume HC. Thermal conductivity sensors are available for % Volume H2 and % Volume CH4. The unit is also compatible with the smart plug and play toxic sensors for the detection of NH3, AsH3, CI2, HCN, PH3, and SO2. With the wide variety of sensors and gas detection available, the Eagle 2 can be customized to meet almost all worksite gas detection needs.

Exclusive Features

The monitor has a long internal pump that can draw samples for up to 125 feet. The pump features a low flow auto shut off and alarm. This allows operators to respond swiftly from a safe distance. The unit is multilingual with 5 different language preferences, and features an alkaline battery life of 18 hours or a NiMH life of 20 hours. To protect the integrity of the device and the configurations, the unit can be password protected. The Eagle 2 also has standard data logging capabilities for easy research, evaluation, and site monitoring. To reduce calibration costs and time, the unit features an automatic calibration option and a single gas calibration option.

The Eagle 2 is heavily protected from environmental conditions by a weather proof, chemical resistant RFI/EMI coated high impact polycarbonate/PBT blend enclosure. The enclosure also renders the unit water and dust resistant. Because of the enclosure, the Eagle 2 can function in 2 inches of water without leakage.

Eagle 2 Specifications

The portable and durable unit is lightweight at less than 4 pounds. Its dimensions are suitable for convenient carrying (9.5?L x 5.25?W x 5.875?H), and it features a conveniently placed durable top handle. The large easy to read display has a polyurethane overlay backlights on demand and when the alarm is activated. The 2 alarm channels are fully adjustable for the user and can be password protected. With a 95 dB buzzer and 4 high intensity LEDs, the alarm is sure not to be missed. The Eagle 2 is standard with a 2 year warranty for material and workmanship and a 1 year warranty for PID sensor.

*Please note we can only ship RKI products to customers within the United States

MISC-MP4K-WUVIR-c4 Same as MiScope Megapixel MP4 but also includes on/off for white, UV and IR LEDs or turn all the LEDs off and use side or bottom lighting by Zarbeco

Depending on the image size and resolution quality you need, the MiScope Megapixel MP3 and MiScope Megapixel MP4K both have a range of optional tools and accessories. Video ToolBox imaging software is included with both, enabling you to view live images on your computer screen and capture still pictures or movies which can be emailed or later displayed on a computer projector.

MiScope Megapixel MP3 Features

• 10-180x magnification
• View live and capture images on the computer screen
• Portable with a laptop computer, touch-screen, tablet or mobile device
• Optional Extended Field (EF) with up to 2 1/2" view @6-123x
• USB 3.0 (backward compatible with USB 2.0 at slower speed)
• Optional IR and/or UV illumination (Multi-spectral imaging)
• Optional filter set or filter wheel for IR Luminescence imaging
• Includes our Video Toolbox PRO PC Software for capturing still and moving images, time lapse, enhanced measurement, labeling, draw-on features and digital zoom
• Includes varying thickness Ushim set for fixed magnifications
• Optional VTB Premier Software Includes: calibrated overlays, side by side comparisons, edge detection, optional CAD overlay

MiScope Megapixel MP4K Features

• Ultra high resolution lens
• Resolution to 1 micron with up to 400x magnification
• Connects to the USB port of your desktop or laptop computer
• Includes our upgraded Video Toolbox Premier PC Software with all PRO features plus side by side comparison, calibrated overlays, low-light frame averaging, enhanced measurement tools, pixel level adjustment, magnifier window, edge detection, and optional CAD file import/export
• Optional IR and/or UV illumination (Multi-spectral imaging)
• Includes varying thickness Ushim set, for fixed magnifications
• Working distance up to 2.5 inches, for up to a 1.5 inch field of view
• Adjust the slider arm on the side of the MiScope MP4K to simultaneously control focus and zoom
• Frame rate up to 60 frames/second at HD resolution using USB3; 30 frames/second at 4k resolution with barely perceptible lag (dependent on PC performance)

Computer Requirements for MiScope Megapixel MP3

Minimum system requirements: Pentium IV 1.5 GHz or faster, Windows 7/8/10, DirectX 8.1 or greater, USB 2.0 Port (USB 3.0 port suggested), 2+ GB of Free Memory, Video card with 256 MB of video RAM, minimum 1280 x 1024 resolution at 16-bit color (contact Zarbeco for recommended system requirements). MiTools Mac® Software optional. Android™ 4.2 or higher; compatible with third-party app.

Computer Requirements for MiScope Megapixel MP4K

Minimum system requirements: Pentium IV (4th generation or higher) 1.5 GHz or faster, Windows 7/8/10, DirectX 8.1 or greater, USB 2.0 Port (USB 3.0 port suggested), 2+ GB of Free Memory, Video card with 256 MB of video RAM, minimum 1280 x 1024 resolution at 16-bit color (contact Zarbeco for recommended system requirements).

T02-0003-000 AutoRAE 2 Cradle for ToxiRAE Pro by RAE Systems

The AutoRAE 2 Automatic Test and Calibration System for RAE Systems portable monitors makes instrument testing and calibration compliance as easy as pressing a button. Simply cradle the monitor, and the system takes care of calibration, testing, and battery recharging.

The AutoRAE 2 system is flexible and modular, and can be configured to efficiently meet your calibration and records management requirements. An AutoRAE 2 system can be as simple as a single cradle deployed in stand-alone mode to calibrate one instrument at a time, or as powerful as a networked, controller-based system supporting 10 instrument cradles and 5 distinct calibration gases or gas mixtures.

Key Features

• Automatic testing, calibration, charging system
• Deployable as a stand-alone cradle or a controller-based system with up to 10 cradles
• Controller with a large, color LCD display
• Networking capability
• Up to 5 calibration gas cylinders can be connected at the same time
• Automatic instrument FW update option
• Instruments datalogging file recorded automatically on controller SD card
• Bench-top or wall-mounted use
• Instruments supported: ToxiRAE Pro Series/QRAE3, MicroRAE/MultiRAE Series (except diffusion model)
• Single Cradle for all Handheld PID, QRAE 3 and ToxiRAE Pro family instruments

Industries

• Oil and Gas
• Industrial
• Environmental
• Fire Service
• National Security

3626-211 D-ReX PoS Gas Detector with 5 relays and Enclosure, Nitrous oxide (N2O) MK263-10, 0 - 1% vol. by GfG

The D-ReX is a very user-friendly, easy-to-maintain gas detector.

High-resolution, full-color display

The 2.4, 320 x 240 pixel full-color TFT display sets new standards for gas detectors. It provides clear and precise information about the current measured values, the short-term and long-term exposure, as well as any malfunctions that may have occurred. Information can be displayed in a variety of languages and scripts, including English, German and Simplified Chinese.

Clear Information

No longer will you have to decipher cryptic error codes – information on any issue is instead displayed in plain text. Status LEDs provide an additional instant overview of vital components of the system.

Intuitive device management using Bluetooth and app

Settings on the D-ReX can easily be managed using the configuration program or the GfG app (Android). They can be connected to the device either via RJ45 an interface or Bluetooth. This will give you access to all settings and configuration options. After entering the password, changes can also be made using the control keys in the D-ReX's service menu.

Advanced connectivity

The D-ReX comes with a wide variety of communication interfaces: Choose between analog, industry standard 4-20 mA, digital RS-485 interface (Modbus/RTU), Ethernet (Modbus/TCP) and LonWorks (optional) for signal transmission. The Bluetooth option enables wireless connectivity. In addition to the five internal, programmable changeover contact relays (optional), 16 additional relays can be addressed by connecting the D-ReX to a GMA200-RT/D relay module.

Periodic sensor self-tests

The plug-and-play smart sensor cartridges are pre-configured and pre-calibrated for easy installation or replacement. Automatic sensor self-tests increase safety while reducing maintenance costs even further.

The new Standard for Versatility: D-ReX

All the advantages mentioned perfectly qualify the D-ReX for numerous applications in virtually all industries. Some of its unique features make it particularly suitable for use in the semiconductor industry, photovoltaic industry and industrial manufacturing as well as in laboratories. If you are looking for the gas detector that best suits your needs, the D-ReX will be your first choice for many applications.

Possible areas of application:

• MRI Labs
• Process tools
• Vacuum pumps
• Scrubbers
• Gas cabinets
• Ambient breathing zones
• Storage areas
• Cleanroom environments
• Sub fab systems

Features:

• Sensors for more than 30 gases
• Hot-swappable smart sensor cartridge
• High-resolution, full-color 2.4" TFT display
• Plain text information
• Tool-free maintenance
• Power-over-Ethernet (PoE) communication
• Can be addresses via web portal
• Password-protected menu
• Interface: Analog: 4 20 mA output; Digital: RS-485 (Modbus/RTU); 10/100 Mbit Ethernet (Modbus/TCP)
• Bright status and alarm LEDs
• Data logger to review sensor and alarms history
• CE marked and UL certified

USPs:

• Tube length up to 30 m / 100 ft.
• Extension cable 1 m / 30 m
• Easy to replace mechanical component of internal pump
• Bluetooth®

Options:

• 16x external relays (GMA200-RT/D)
• Line Integrity Monitoring

726-120-02 Eagle 2 Portable Monitor for CH4 (100% LEL/100% Volume (IR) Autoranging)/O2/H2S/CO/CO2 10,000 ppm (IR)/NH3 by RKI Instruments

Continuing in its legacy of durable and reliable gas detection and monitoring systems, RKI Instruments is proud to offer a new product in its popular Eagle portable gas detector series. The Eagle 2 can monitor up to 6 different gases and is equipped with several exclusive features that can only be found with the Eagle series. In addition, its large glove friendly push buttons and LCD screen ensure an ease of use when onsite. Rated intrinsically safe, the Eagle 2 is equipped with state of the art technologies that are not available with other competitive gas detectors and monitors.

Specialty Sensors

The Eagle 2 has a variety of available specialty sensors. Workers can use a photoionization detector for low or high range VOC detection and Fence Electrode Technology for humidity and contamination resistance. An infrared sensor is available for Co2, % LEL CH4, % Volume CH4, % LEL HC, and % Volume HC. Thermal conductivity sensors are available for % Volume H2 and % Volume CH4. The unit is also compatible with the smart plug and play toxic sensors for the detection of NH3, AsH3, CI2, HCN, PH3, and SO2. With the wide variety of sensors and gas detection available, the Eagle 2 can be customized to meet almost all worksite gas detection needs.

Exclusive Features

The monitor has a long internal pump that can draw samples for up to 125 feet. The pump features a low flow auto shut off and alarm. This allows operators to respond swiftly from a safe distance. The unit is multilingual with 5 different language preferences, and features an alkaline battery life of 18 hours or a NiMH life of 20 hours. To protect the integrity of the device and the configurations, the unit can be password protected. The Eagle 2 also has standard data logging capabilities for easy research, evaluation, and site monitoring. To reduce calibration costs and time, the unit features an automatic calibration option and a single gas calibration option.

The Eagle 2 is heavily protected from environmental conditions by a weather proof, chemical resistant RFI/EMI coated high impact polycarbonate/PBT blend enclosure. The enclosure also renders the unit water and dust resistant. Because of the enclosure, the Eagle 2 can function in 2 inches of water without leakage.

Eagle 2 Specifications

The portable and durable unit is lightweight at less than 4 pounds. Its dimensions are suitable for convenient carrying (9.5?L x 5.25?W x 5.875?H), and it features a conveniently placed durable top handle. The large easy to read display has a polyurethane overlay backlights on demand and when the alarm is activated. The 2 alarm channels are fully adjustable for the user and can be password protected. With a 95 dB buzzer and 4 high intensity LEDs, the alarm is sure not to be missed. The Eagle 2 is standard with a 2 year warranty for material and workmanship and a 1 year warranty for PID sensor.

*Please note we can only ship RKI products to customers within the United States

44ES-421-CO2 44 Liter 5-Gas (100 PPM CO, 25 PPM H2S, 2.5% CH4, 18% O2, 0.5% CO2) Ecosmart Refillable Cylinder, Nitrogen Balance by Gasco

The NEW 44-liter refillable, portable cylinder that delivers 29% more calibration gas than the disposable 34-liter cylinders. 44-liter ecosmart cylinders hold pure and mixed gases and are interchangeable with the current 34-liter aluminum cylinders on the market.

Features & Benefits

• 44-liter
• Refillable
• 29% more capacity than the standard 34-liter cylinder
• Portable
• Lightweight
• Interchangeable with 34-liter disposable cylinders
• Increases efficiency
• Holds pure and mixed gases
• Eliminates disposal fees and regulatory paperwork

08080-77 Stainless Steel Bimetal Pocket Thermometer, 1" Dial, Poly Lens, 8" Stem, 0-220F, 2F Div by Digi-Sense

• Factory tested to three points with a ±1% accuracy
• Minimum immersion: liquids 2" (50 mm), gases 4" (100 mm)
• Hermetically sealed dial stops internal fogging
• Recalibrate using external adjustment nut
• 304 Stainless Steel dial case and stem
• Shock resistant

Includes

All thermometers come with a statement of test, and a plastic storage sleeve with pocket clip

G460-11-10-16-00-14 G460 Multi-Gas Detector with Alkaline Smart Pump and Alkaline Battery, O2, Catalytic Combustion LEL Sensor, SO2, NH3 by GfG

For over 50 years, GfG Instrumentation has worked to develop the most reliable and effective equipment for gas detection and measurement technology. Developed by a team of highly experienced scientists and specially trained engineers, GfG products are high quality reliable instruments designed to meet the unique needs of potentially hazardous worksite. With the introduction of the G460 Multi-Gas Detector, GfG Instrumentation is continuing the trend.

G460 Multi-Gas Detector

The G460 Multi-Gas Detector is a compact and robust system with the capabilities of detecting up to six different gases and simultaneously displaying the readings. The portable detector features a user friendly and intuitive interface to simplify the day to day operations.

Ease of Use

For typical daily operations, the G460 Multi-Gas Detector operates with a single button. The complete user interface can provide access to advanced setup options with three buttons. The unit also features easy calibration operation. Simply attach the calibration adapter and apply gas. The G460 will automatically perform the appropriate adjustments. The detector will then store the dates of the three most recent calibrations for each sensor.

The G460 also features a large easy to read tricolor display which uses a color code to indicate the alarm severity. From green to orange to red, the tricolor display is intuitive and incredibly user friendly. The display feature can also flip or zoom with the touch of a button. The G460 multi-faceted alarm system also includes an ultra loud audible buzzer at 103 dB, a standard vibration mechanism, and 360 bright LED alerts (the LED alerts can also be equipped to function as flashlights). This multi-faceted system is sure to alert users and those nearby of the potential hazardous conditions. For smooth and continuous operations, the G460 Multi-Gas Detector uses interchangeable alkaline and rechargeable battery packs that provide up to 25 hours of continuous operation. Using a drop in cradle charger, the rechargeable pack can completely recharge in less than 4 hours.

G460 Multi-Gas Detector Features

The G460 Multi-Gas Detector features a motorized pump with a built-in diffusion or sample draw mode switch. The hose is easily attachable and can draw from 100 feet away. The hose is powered by its own battery pack that provides 20 hours of continuous operation. The multi-gas detector also features the widest range of sensors on the market. The compatible long lasting (and interchangeable) smart sensors include LEL, SO2, O2, H2, H2S, NO, CO, O3, HF, NH3, CIO2, CI2, PH3, ETO, HCN, and NO2. Users can purchase additional sensors to help customize the unit such as infrared sensors for the measurement of CO2 and photoionization sensors for volatile organic chemical hazards. The G460 has standard data logging capabilities that store up to 55 hours of the most recent activities. Alarm activations gas thresholds and stored permanently in the internal memory. Employers can download all internal information to generate reports and monitor results.

73-8501RK GP-88AS Sample Draw Dual PPM Scale Combustible Detector, 0 - 500 PPM, 0 - 5000 PPM Hydrocarbons (Toluene) by RKI Instruments

Features

• PPM low range gas surveyor for solvent gas/toxic gas/combustibles
• Sample drawing system
• Peak hold function
• Audible/visual alarm
• Compact, light design
• Meter illumination in dark sites
• User-replaceable batteries
• Continuous monitor and readout
• Low battery alarm
• Intrinsically safe design in Japan

*Please note we can only ship RKI products to customers within the United States