$200 - $300

Part Number: 44L-475

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

AI3108 LabSen 801 Glass-body pH Electrode for Purified Water& Low Ion-Concentration Solutions by Apera

Built with proprietary sensor technology and premium materials from Switzerland, Apera LabSen 801 Glass-body pH Electrode is made for pH measurements of pure water such as distilled and deionized water, and other low ion concentration solutions.

LabSen L-type glass membrane - fast response in low ionic strength solutions thanks to its ultra-low resistance formula (>50M&Omega), providing fully stabilized readings in 30 to 60 seconds.

Movable Sleeve Junction - easy to clean, especially suitable for low ionic strength solutions, emulsions, and suspensions. The infiltration rate of the electrolyte can be adjusted by the tightness of the sleeve.

Silver Ion Trap Reference System - On top of the Long-Life reference system, a silver ion trap is added to further prevent junction clog.

The electrode uses a BNC connector, compatible with any pH meters that use BNC connectors. No temperature sensor is built-in. Users need to have a separate temperature probe (ex: Apera Instruments MP500) to enable ATC or manually input temperature to realize temperature compensation.

• Proprietary sensor technology and premium materials from Switzerland
• Built with LabSen L-type glass membrane for low ionic strength solutions
• Movable Sleeve Junction - easy to clean, adjustable infiltration rate
• No more air bubbles inside the glass membrane thanks to the Swiss blue gel electrolyte.
• Silver ion trap reference system

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

Part Number: 44L-412

WD-35634-65 CTSTestr™ 50C Cup-Style Waterproof Pocket Conductivity/TDS/Salinity Tester, Premium 50 Series by Oakton

New design stands up to the challenges of measuring water quality even stands upright

The Oakton conductivity pocket testers stand up to everyday use, harsh environments, and the test of time. The testers can even stand upright when the cap is used as the stabilizing base. When you choose one of these conductivity testers, you get a pocketful of useful features and benefits.

• Easy-to-replace sensor module lets you use the tester body over and over again
• Intuitive interface has self-diagnostic error messages, and battery-life and stable reading indicators
• Simple operation at your fingertips with MENU button, 1-button calibration, and HOLD button to freeze readings for recording
• Valox® body resists most chemicals and is rugged, dustproof, waterproof, and IP67 rated
• Leakproof cap functions as a sample cup, hydrating cup, and stabilizing base to stand the tester upright
• Uses common AAA batteries

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

Part Number: M101635PM2

Part Number: 44L-476S

US2020 Bacteria Tests: Hygenia Ultrasnap Free ATP Water Swabs, 100 pk by AquaPhoenix

AquaSnap ATP Surface Test; is a user-friendly, all-in-one ATP sampling test. This pen-sized sample collection device is easy to use, small and environmentally friendly. In addition, UltraSnap uses a unique liquid-stable reagent providing superior accuracy, longer-lasting singal strength and more reproducible resutls. Results in 15 seconds. Easy-to-use - just collect, snap and squeeze! Self-contained, liquid-stable reagent offers reliable results. Patented Snap-Valve technology provides unprecedented accuracy and reproducibility. Pre-moistened swab bud enables maximum sample collection. Tolerant to temperature abuse.

PH60-MS pH Tester Kit for Small Volume or Test Tubes with LabSen 246-5 ATC Semi-Micro pH Electrode by Apera

Discover the next level of precision, reliability, and portability with our top-rated professional PH60 tester, now paired with the Swiss LabSen 246-5 pH/temp. electrode. This powerful combination revolutionizes pH measurement, especially in small-volume test (as low as 60μL) for general water solutions. Elevate your pH measurement experience with our comprehensive test kit that leaves no detail unaddressed. This all-inclusive kit not only includes ready-to-use calibration buffer solutions and soaking solution but also features the Apera CalPod Solution Organizer for optimizing your calibration process and a semi-micro container for small volume sample test. All components are conveniently housed in a rugged carrying case, ensuring that you can effortlessly perform reliable pH measurements and calibrations wherever you go.

• PORTABILITY + RELIABILITY — The top-rated professional pH tester is now paired with the Swiss LabSen 246-5 pH/temp. electrode, allowing you to effortlessly take lab-grade pH measurement in small volume or test tubes for general water solutions wherever you go.
• SWISS SENSOR TECH — Crafted with Swiss sensor technology and premium materials, the LabSen electrode's ø6mm sensor tip is designed for measurement in small volume as low as 60 μL with the usage of the semi-micro container included in the kit.
• ROBUST REFERENCE SYSTEM — LabSen 246-5 employs a Long-Life Reference System, outperforming ordinary Ag/AgCl systems by maintaining reference potential stability over time, which significantly extends the electrode's service life.
• INTELLIGENT METER BODY — The water-resistant meter body is featured with intelligent functions such as Automatic Calibration, Auto. Temperature Compensation, Reading Alarm Settings, Automatic Reading Lock, and more to meet your precision needs.
• COMPLETE TEST KIT— not only includes ready-to-use calibration buffer (pH 4.00/7.00/10.01) and soaking solutions, but also features the Apera CalPod Solution Organizer for optimizing your calibration process.

93573 2" Dielectric Mirror Diagonal, Twist-Lock by Celestron

Ensure maximum light transmission without loss of optical quality with the Celestron Dielectric Star Diagonal, 2" with Twist-Lock. Upgrade your existing star diagonal to this premium one and enjoy brighter, sharper images without purchasing an entirely new telescope.

This star diagonal reflects the telescope's light path 90° to provide a more comfortable viewing angle. In addition, the glass has 58 layers of dielectric coatings, which provide an over 99% reflective surface, delivering the maximum amount of light to the eyepiece. This 2" star diagonal has the added benefit of allowing you to use larger 2" eyepieces with your telescope, providing a wider field of view, or standard 1.25" eyepieces with the stepdown adapter.

The twist-lock eyepiece holder secures eyepieces while keeping them centered in the diagonal, thus providing best opto-mechanical alignment between the telescope and eyepiece. Unlike traditional thumb screws, the twist-lock cannot scratch or engrave the barrel of your eyepieces. The diagonal has an integrated 2" barrel stop that prevents 2" accessories with long barrels from damaging the mirror.

All the diagonal's mechanical parts are made of machined black anodized aluminum, except the twist lock rings, which are orange anodized for visibility. The interior of the Schmidt-Cassegrain adapter and 2" barrel are glare threaded and painted flat black to prevent glare. With all its features and these high-end finishes, the Celestron Dielectric Star Diagonal, 2" with Twist-Lock is one of the highest quality 2" star diagonals that Celestron has ever offered.

This diagonal also comes with two interchangeable barrels to provide flexibility in connecting the diagonal to a wide variety of telescopes without the need for additional adapters. For telescopes, like refractors, which accept 2" barrels in their focuser, a standard 2" barrel is included. For Schmidt-Cassegrains (SCTs) that use a threaded connection to the focuser, a barrel with SCT threads is included. Both barrels thread onto the diagonal housing, providing a secure connection to the diagonal.

• Enjoy better views through your telescope with this premium diagonal featuring diffraction-limited optics and dielectric coatings
• Provides a 90° viewing angle, perfect for more comfortable viewing through refractor and Cassegrain-type telescopes
• 58 layers of dielectric coatings provide an over 99% reflective surface, ensuring the maximum amount of light collected by the telescope reaches the eyepiece
• Twist-lock keeps the eyepiece centered in the diagonal to provide better optical alignment
• Includes a stepdown adapter, so the diagonal accepts eyepieces, Barlow lenses, threaded filters, and other accessories in both 2" and 1.25" sizes
• Two interchangeable adapters allow you to switch between a Schmidt-Cassegrain thread adapter and a 2" barrel adapter so you can use this diagonal with a wide variety of telescopes

Standard Star Diagonals vs Dielectric Star Diagonal

The key specifications for a star diagonal are its reflectivity and its optical quality. This diagonal delivers top performance in both categories, with an over 99% reflective mirror and diffraction-limited optical quality. This ensures that virtually all the light collected by the telescope will reach the eyepiece without the diagonal affecting optical performance. Using a lower quality star diagonal can both dim the view and degrade optical quality. You can enjoy better views from your telescope by simply swapping out its diagonal for a premium one, like the Celestron Dielectric Star Diagonal.