HM Digital TDS-3 Handheld TDS Meter With Carrying Case, 0 - 9990 ppm TDS Measurement Range, 1 ppm Resolution, +/- 2% Readout Accuracy

HM Digital SM-1 In-Line Single TDS Monitor, 0-9990 ppm Range, +/- 2% Readout Accuracy

HM Digital SP-1 TDS - EC Sensor Probe for Panel Mounted Controllers

Commercial In-Line Dual TDS Monitor

HM Digital DM-1 In-Line Dual TDS Monitor, 0-9990 ppm Range, +/- 2% Readout Accuracy

HM Digital C342 TDS and EC Calibration Solution, 342 ppm (NaCl), 90 ml Volume

HM Digital 1000ppm TDS Calibration Solution

Glasgarten Bacter Ae Shrimp Tank Treatment (70G) | Nutrients For Live Freshwater Shrimp Food / Aquarium Water (Neocaridina, Amano, Red Cherry, Rili)

HM DIGITAL TDS Meters TDS-3 Handheld Temperature TDS ( PPM ) Tester, 0 - 9990 ppm, 1 ppm Resolution, +/- 2% Readout Accuracy Testing Water Quality For Hydroponics Aquariums Pools Drinking etc

HM Digital TDS-4 Pocket Size TDS Tester Meter with 0-9990 ppm Measurement Range , 1 ppm Resolution, +/- 2% Readout Accuracy

TDS Meter, Water Quality Tester Filter Pen, Accuracy Testing Water Quality for Drinking Water Purity Test, Swimming Pools, Aquariums, Etc.

Hach 145300 Total Hardness Test Kit, Model 5-B

General Hydroponics GH1389 GH1389FL Nutrient additive, 1 Quart

WaterSafe Well Water Test Kit - for Drinking Water in Home Tap and Well Water | Simple Testing Strips for Lead, Copper, Bacteria, Nitrate, Chlorine, and more | Made in the USA to EPA Standards