$100 - $150

AI103G GroStar GS3 EC/500ppm/700ppm Pen Tester Kit by Apera

GroStar® Premium Pen Testers are designed specifically for the horticultural market. GroStar's intelligent design reduces the guesswork so you can easily manage your crops success.

Features of GS3 Premium EC Pen:

• Measures conductivity EC, PPM (500), PPM (700) and temperature
• Premium probe technologies and materials ensure high accuracy and durability with minimal maintenance
• Titanium alloy sensor designed for high accuracy EC measurement
• Easy-to-use design and fast calibration adjustment.
• Large 3-color backlit screen gives you clear information
• IP67 waterproof rating
• Replaceable probe
• Powered by AAA batteries with auto off function
• Automatic temperature compensation

Includes:

• 2-year warranty (instrument)
• 1-year warranty (probe)
• 2.77 EC standard calibration solution (50ml bottle)
• Lanyard and user manual

293 Clamp-on Plus DMM with True RMS Capabilities by Test Products International

Digital Clamp-On Meter Amp Plus. The 293 is a clamp-on plus DMM with True RMS capabilities. The 293 offers measurements in all basic electrical functions plus:

Features:

• True RMS: Provides accurate and dependable readings of non-linear loads.
• Bar Graph: When measuring frequency, bar graph indicates current level.
• TRIM Mode: Smooths out unstable readings.
• Peak Mode: For start-up and inrush currents.
• Sleep Mode: Preserves battery life.
• Data Hold: Holds the reading on the display for easy viewing.
• Measure AC/DC volts, resistance, continuity and frequency
• CAT III 600 V rated
• cULus 61010
• 3-year limited warranty

Applications:

• Heat anticipator current in thermostats
• Line voltage
• Control circuit voltage
• Heating element resistance
• Compressor winding resistance
• Contactor and relay coil resistance
• Motor and compressor start up current
• Continuity of wiring
• Frequency on control and line voltage
• Record/Min/Max voltage of controls and line voltages
• Bar graph to indicate rapid fluctuations

The 293 comes complete with the following accessories:

• Carrying Pouch
• Test Lead Set
• Instruction Manual
• Battery

0516 4401 Combo Case for Testo 440 and Several Probes by Testo

The combi-case is ideal for transporting and protecting your equipment.

You can use this case to safely store the following:

• testo 440 or testo 440 dP air velocity and IAQ measuring instrument
• Vane probe (Ø 4 in.) with universal handle (alternatively, turbulence probe or fume hood probe with fixed cable)
• 90° angle for connecting vane probes (Ø 4 in.) for measurements at ceiling outlets
• Either the vane probe (Ø 0.6 in.) or hot wire probe (each with fixed cable), or extendable telescope for air velocity probes with universal handle
• Hot wire or Ø 0.6 in. vane probe head
• Humidity, CO₂, or CO probe (each with universal handle) or high-precision humidity/temperature probe with fixed cable
• Lux probe
• Batteries

• Fits the testo 440 standard or dP model
• Dimensions: 20.3 x 5.3 x 10.1 inches (W x H x L)

Includes:

Combi-case for storing the testo 440, with room for multiple probes

PENPH pH Pen by Bluelab

Perfect for quick and easy pH and temperature readings direct from your solution.

The Bluelab® pH Pen is the preferred option for hand held pH meters. It provides a compact, quick and handy way to manage the success of your crops to ensure maximum uptake of nutrients.

A key parameter that affects nutrient uptake is whether your solution is acid or alkaline. We measure this in pH.

Teamed with our Bluelab® Conductivity Pen you have a robust, convenient and accurate measurement system.

Features:

• Measures pH and temperature
• Selectable units for temperature
• Fully waterproof
• Backlit LCD display
• Double junction probe (not replaceable)
• Simple two point calibration process with 30 day calibration indicator
• Hold reading function
• Low battery indicator
• Auto off function
• Automatic temperature compensation
• 1 AAA replaceable battery included

LabSen 333 POM Combination pH/Temp. Electrode for Wastewater Treatment by Apera

Backed by proprietary Swiss pH sensor technology and materials, the LabSen® 333 3-in-1 pH/Temp. The electrode is temperature compensated pH electrode and is designed for testing wastewater, emulsion, suspension, and samples containing protein and sulfide (This is a replacement probe for Apera Instruments SX811-WW Portable pH Meter for Wastewater).

LabSen unique blue hemispherical glass membrane - faster response time, better repeatability, and built tough, highly resistant to general impact (totally differentiates from the fragile conventional glass bulb membrane).

Long-Life Reference System - The LabSen 333 pH electrode adopts a long-life reference system, which is composed of a glass tube, AgCl, and a reference silver wire. The top end of the slim glass tube is stuffed with cotton, which prevents the reaction between AgCl and electrolyte when the temperature changes. It improves the stability of reference electrode and extends the service life of the electrode.

Polymer Electrolyte - The solid polymer electrolyte is in direct contact with test samples. The anti-pressure capacity can reach up to 6 bars, making it ideal for testing suspension and wastewater. No more frustrating clogged junctions.

Compatible with Apera Instruments' meters such as PH700, SX823-B, MP511, PH800, PC800. May NOT work with other brands' meters because the temperature unit might be incompatible.

The electrode is backed up with a 6-month warranty fulfilled by Apera Instruments.

• Unique LabSen blue glass membrane from Switzerland, faster response rate, better repeatability, and impact-resistant
• Polymer Electrolyte, ideal for testing wastewater and suspension. No more clogged junction.
• Long-Life Reference System, improving the stability of reference electrode and prolong the service life of the electrode
• POM housing, highly resistant to corrosions

pH56 Pocket-size pH / Temperature Meter with Replaceable Electrode by Milwaukee

Waterproof pH testers with Large dual-level LCD that displays pH and temperature (°C or °F).

The large display shows readings in an extended range from -2.0 to 16.0 pH (pH56 has a 0.01 pH resolution) and simultaneously shows temperature from -5.0 to 105.0°C or 23.0 to 221.0°F.

They have a stability indicator and hold function that freezes the display for easy and accurate recording.

The large display also has graphic symbols to guide you through all operations.

Complete with a temperature probe for faster and more precise temperature measurement they compensate automatically for temperature.

Calibration is made automatically in 1 or 2 points with memorized standard and NIST buffer sets. Auto power OFF saves battery power after non-use.

The double-junction electrode can be replaced in a very fast and simple way! The modular design allows easy electrode and battery replacement.

To house T3 and charger.

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

BEM401 TDS - PPM Mini-Bench Meter by Milwaukee

• Manual calibration 1 points
• Faster Processor with The New Chipset and Motherboard
• 100% Larger & Easier To Read LED Display
• Smaller, Ergonomic & Lighter Case Design
• Includes 9vDC power supply, mounting Kit, MA811D/1 TDS probe, probe holder, and 20ml 1382ppm calibration solution

94308 Observer's Accessory Kit by Celestron

• This Celestron eight-piece accessory kit enhances the performance of your telescope.
• Includes two high-quality 1.25" Plossl eyepieces, a 2X Barlow lens that can be used visually or photographically, three eyepiece filters, a cleaning cloth, and a case.
• With two extra eyepieces and a Barlow lens, you'll have four different magnifications to choose from.
• A Moon filter helps to dim the bright light from the Moon, making it more comfortable to view so you can see more detail! The two color filters (Red & Blue) highlight features on Mars, Jupiter, and Saturn.
• A hard plastic carry case keeps everything safe in the foam-lined interior.

The Celestron Observer's Accessory Kit is a great way to expand the functionality and enjoyment of your telescope. Inside the plastic, foam-lined carry case you'll find these accessories:

• 17 mm Plossl Eyepiece - 1.25"
• 6 mm Plossl Eyepiece - 1.25"
• 2x Barlow Lens/T-Adapter - 1.25"
• #80A Blue Filter - 1.25"
• #25 Red Filter - 1.25"
• Moon Filter - 1.25"
• Microfiber Cleaning Cloth

Eyepieces - The 17 mm and 6 mm Plossl eyepieces can be used in any telescope with a 1.25" focuser. Each eyepiece features a four-element design with a 52° apparent field of view. The lenses are fully multi-coated to improve light transmission and protect the optics. The 17 mm Plossl eyepiece offers a nice medium magnification view in most telescopes, and the 6 mm Plossl provides high magnifications, great for the Moon and planets, especially when seeing conditions are good.

2x Barlow Lens/T-Adapter - The included versatile 2x Barlow will double the magnification of any 1.25" eyepiece. The 17 mm Plossl included in this kit will double in power, effectively becoming a 8.5 mm eyepiece, and the 6 mm will provide the magnification of a 3 mm. Any other 1.25" eyepieces you already have will also work in this desirable accessory, giving you even more magnification choices. Remember, high magnifications do not always produce clear, sharp results, especially on evenings of poor or moderate seeing conditions. Experiment to find the magnifications that are best for you and your telescope. T-threads are machined into the top portion of this Barlow lens, allowing a user to attach a camera with the addition of an optional T-ring. Instructions for attaching your camera are included with the Observer's Accessory Kit.

Filters - Colored filters bring out certain details on a planet's surface or its cloud structure. Both planetary filters, as well as the Moon filter, can be used on any 1.25" eyepiece with the proper filter threads. Just screw one onto your eyepiece of choice and slide it into the focuser.

• The #80A is a medium-blue filter that enhances the contrast of the cloud belts on Jupiter and the polar ice caps on Saturn. It also can be used to increase contrast on the Moon if you don't mind the color shift.
• The #25 filter is a deep red color and is a good choice when you want to define the polar ice caps on Mars. It's also fun to use this filter when observing Jupiter. The #25 Red filter blocks quite a bit of light coming through your telescope, however, so it is best used on bright objects with larger aperture telescopes.
• The Moon filter is one of the first accessories most new amateur astronomers buy, and for good reason! It helps block out a portion of the light the Moon sends into your eyepiece so you can see details better. You can also try this filter on Venus; it blocks enough glare so that the planet's phases can more easily be seen.

Cleaning Cloth & Case: Keep the microfiber cleaning cloth stashed in your Observer's Accessory Kit so that it will always be handy. Use it to safely remove fingerprints and smears from your optics without leaving residue behind. Remember to blow or brush any dust particles off of your optics before rubbing them with the cloth.

The black plastic carry case has die-cut foam inside to protect and cushion your accessories. Keep each one in its appointed place when not in use and you'll keep them looking and performing like new. The case is large enough to carry a few extra accessories safely.

91210-07 Traceable® Big-Digit Thermocouple Thermometer with Calibration by Digi-Sense

Thermometer reads from -58 to 2000°F and -50 to 1300°C with a resolution of 0.1° and 1°. Switch from °F to °C at the touch of a button. Easy to read big digits measure over 5/8-inch-high and are readable from 15 feet away. Unit features HOLD button that freezes display to capture current reading. MAX HOLD feature permits capturing and displaying the highest temperature achieved over any time period.

Intuitive, four-button operation makes it easy-to-use. Microprocessor updates the display 2.5 times per second. Rugged unit is constructed of shock-resistant ABS plastic. Meter only accuracy: ±0.3% of the reading plus 1°C between -50°C to 1000°C, otherwise 0.5% of the reading plus 1°C. Uses all Type-K thermocouple probes.

Traceable® products are calibrated to NIST-traceable standards and ready to use as soon as you receive it. Each product goes through an intense vetting process before it can carry the Traceable name, and it includes NIST-traceable certification. This means that a 17025-accredited calibration test lab has confirmed that the product meets or exceeds all stated specifications, saving you both time and money by not having to calibrate separately.

NIST-traceable calibration also helps you meet quality standards and regulatory compliance for ISO, FDA, cGMP, VFC, CAP, CLIA and Joint Commission requirements.

• Get accurate, reliable measurements with included NIST-traceable calibration

Includes

Carrying case, NIST-traceable calibration certificate with data, battery, and fast-response, Type-K beaded probe with 4-foot cable.