$150 - $200

93781 Illuminated RACI Finder Scope by Celestron

The Celestron 9x50 Right Angle Correct Image (RACI) Illuminated Finder is a great upgrade to the stock finderscopes found on many Schmidt-Cassegrain telescopes. The 50 mm optics produce bright, sharp images with a magnification of 9X and a 5° apparent field of view. Meanwhile, the right-angle, correct-image design keeps objects right-side up and left-to-right correct, making it easier to locate objects as well as track them as they drift through the field of view. The eyepiece module can be rotated left or right so you can find the perfect viewing angle.

The double-crosshair reticle etched in the eyepiece makes it easy to center an object, whether you are aligning your computerized telescope or finding deep-sky objects on your own. The reticle can be focused separate from the finder itself. A battery-powered illuminator lights up the crosshair with a soft, red glow, and the illumination can be easily adjusted by turning the on/off knob.

The Celestron 9x50 RACI Finder comes with a sturdy bracket consisting of two rings and an integrated dovetail. Adjusting the alignment of the finder is easy with the oversized thumbscrews. The dovetail allows for easy attachment to and removal from most Schmidt-Cassegrain and EdgeHD optical tube assemblies without affecting the alignment of the finderscope.

• Upgrade your finder and stop straining your neck & back!
• This well-built 9x50 finder displays right side up, left-to-right correct views, a great choice for both daytime and nighttime use.
• Illuminated double-crosshair reticle doesn't hide stars.
• Includes double ring bracket with integrated dovetail.

SXL-FVX1 Fill System with Valve by Agrowtek

Electronic optical "liquid level control system" includes two liquid sensors for high and low "fill" or "drain" control of fluids in tanks, reservoirs, etc. Only power and a valve or relay is required to complete the level control system; no external controller required. Easy to wire and setup. Includes one standard and one latching sensor. Compatible with 5-24Vdc valves and relays. Available with optional VX1 water valve kit or RX1 outlet kit for direct operation of 120Vac pumps, valves and other equipment.

610-0034-000 Carbon Dioxide, 50% (balance nitrogen), 34 Liters by RAE Systems

Green cylinder technology not only saves the environment, it also saves time and money.

• Gas cylinder size options 34, 58 and 116 liter
• Green Refillable cylinder
• "Strip and Ship" program for easy return of empty cylinders
• Small cylinder footprint
• Cylinder technology offers exceptional gas stability
• All gas cylinders use the same valve

LabSen 805 Glass-body pH/Temp. Electrode for Purified Water& Low Ion-Concentration Solutions by Apera

Crafted with proprietary sensor technologies and premium materials from Switzerland, Apera LabSen 805 Glass pH/temp. Electrode is engineered for quick and high-precision pH measurement of pure water such as distilled water, drinking water, RO water, surface water, well water, boiler water, storm water, deionized water, etc.

• The L-type olive-shape membrane simply provides fast response in low ionic strength solutions and low temperature liquid thanks to its ultra-low resistance formula (<50MΩ) and large hydrogen ion sensing area, helping you obtain a stabilized reading in a much easier manner.
• The Long-Life Reference System simply maintains the reference potential stability in a longer term, significantly extending the electrode's service life.
• Triple ceremic junctions ensure quick electrolyte discharge for fast response in pure water pH measurement
• The built-in temperature sensor enables automatic temperature compensation.

AI3107 LabSen 371 PVC-body Flat pH Electrode by Apera

Built with proprietary sensor technology and premium materials, Apera LabSen 371 POM-body pH Electrode is designed for flat surface pH measurement such as skin, paper, textiles, etc.

Special Flat Glass Membrane - LabSen 371 pH electrode adopts a flat glass membrane with PTFE ring junction, making reliable surface pH test easier than ever.

Long-Life Reference System - 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 system and extends the service life of the electrode.

The electrode uses a standard 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 pH sensor technology and premium materials from Switzerland
• Special LabSen flat glass membrane, suitable for flat surface pH measurement such as skin, textiles, paper, etc.
• Long-Life Reference System, improving the stability of reference electrode and prolong the service life of the electrode
• Anti-clogging PTFE ring junction
• No more air bubbles inside the glass membrane thanks to the Swiss blue gel electrolyte.

08506-70 Type T Quick-Response PFA-Insulated Thermocouple Probe by Digi-Sense

All insulated-wire probes include straight insulated cable with no handle and feature ANSI color-coded miniconnectors: type T-blue. This quick-response PFA-insulated probe, is 40-gauge (0.003" dia) wire, with a 0.009" outer diameter and is 3-ft in length. This microoprobe is for tissue implantable and ideal for semisolids.

• Response time: 0.025 seconds

Includes

five 23-gauge hypodermic needles.

2272100 Digital Titrator Reagent Set: Hardness, Total, Calcium, Magnesium by AquaPhoenix

For Calcium and Total Hardness determination by EDTA Digital Titrator titration. Ranges: 10-160 and 100-4000 mg/L as CaCO3. Reagent Set Contains: Buffer Solution (Hardness 1), CalVer® 2 Calcium Indicator Powder Pillows, ManVer® 2 Hardness Indicator Powder Pillows, Potassium Hydroxide Solution (8 N), EDTA Titration Cartridges (1 each) (0.800 and 0.0800 M).

• Accurate results - when and where you need them
• Fast and Flexible
• Versatile
• Economical

Part Number: J1013100PA

Part Number: J197120LM5

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

Old Part Number: Z107950
New Part Number: Z107950PN

Part Number: 103L-395XSP

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