$25 - $50

SX-T -20 to 60°C 3ft Temperature Probe by Agrowtek

Stainless steel probe, 1/4" diameter x 3" with 3ft lead. Made in USA.

93653-A 1.25" Visual Back by Celestron

A Visual Back is a metal adapter that screws onto the standard rear cell threads of Schmidt-Cassegrain and Maksutov-Cassegrain telescopes and accepts 1.25" accessories, including diagonals, eyepieces (for straight-through viewing), Barlows, webcams, and any other accessory with a 1.25" insert barrel.

All Celestron 5", 6", 8", 9.25" and 11" Schmidt-Cassegrains come standard with the 1.25" Visual Back.

To use 2" diagonals on a Celestron 5" - 11" Schmidt-Cassegrain, remove the visual back and thread on a 2" diagonal made especially for Schmidt-Cassegrain telescopes, such as the Celestron 2" XLT Diagonal (#93527).

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

PH-0014-PK Test Strips: pH, 0-14.0 100/pk by AquaPhoenix

Non-bleeding pH test strips.
Gradation of scale: 0 - 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14

Ref: 51212

18527-13 Miniature Type-K Thermocouple Male Connector, 2 Pin by Digi-Sense

• Molded barriers prevent short circuit and the solid pin design ensures good contact even in demanding applications
• Miniature connectors are suited for small wires and mineral insulated cables
• Connector-body color is brown, calibration type (J or K) is printed on the body

K-4502 Total Hardness Titrets® Test Kit (2-20 ppm) by AquaPhoenix

Increments: 2.0, 2.2, 2.4, 2.6, 2.8, 3.0, 3.2, 3.6, 4.0, 5.0, 6.0, 7.0, 8.0, 10, 14, 20 ppm CaCO3

Features of Titrets Technology:

• Dependable, sealed single-use titrants
• Fast, easy procedure — no need to count drops
• No burettes or other equipment necessary
• Perform a titration ANYWHERE

C-3810 Cyanide Comparator (flat), Free by AquaPhoenix

C-3810 High Range Cyanide Comparator is a component of K-3810 Cyanide (free) CHEMets Visual Test Kit and is designed to be compared against the color formed in R-3810 Cyanide (free) CHEMets Refill. The comparator's range is applicable for many drinking water and surface water applications. Color standards are blue in color and cover a range of 0-1.0 ppm cyanide (CN-).

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

K-9815 Total Alkalinity Titrets® Test Kit (50-500 ppm) by AquaPhoenix

Increments: 50, 55, 60, 65, 70, 75, 80, 90, 100, 125, 150, 175, 200, 250, 350, 500 ppm

Features of Titrets Technology:

• Dependable, sealed single-use titrants
• Fast, easy procedure – no need to count drops
• No burettes or other equipment necessary
• Perform a titration ANYWHERE

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

18527-90 Compression Fitting; Probe Diameter 1/8"; 316 Stainless Steel; 1/8" NPT (M) by Digi-Sense

Use fittings for straight-shaft probes and metal tubing only. Tighten compression nut to secure and completely seal probe. Replacement ferrules let you reuse a compression fitting when replacing a worn-out probe. Simply disassemble fitting, discard probe and old ferrule, install replacement ferrule over probe sheath, and retighten fitting. Connectors come in both 316 Stainless Steel and Brass.

• Available in both 316 Stainless Steel and Brass