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TDS-3 Handheld Meter With Carrying Case is a tool to measure Total Dissolved Solids (TDS) or the total amount of mobile charged ions, including minerals, salts or metals dissolved in a given volume of water. It is very portable, reliable and accurate in testing water and other solutions due to its advanced microprocessor technology. This handheld meter is ideal for all water purification applications, wastewater regulation, aquaculture, hydroponics, and colloidal silver. Perfect for both consumer or commercial use. • Efficient and accurate. • Saves measurements for convenient reading and recording. • Conserves battery, shuts off automatically after 10 minutes of non-use to conserve batteries. • Measurement Range: 0-9990 ppm. From 0-999 ppm, the resolution is in increments of 1ppm. From 1000 to 9990 ppm, the resolution is in increments of 10 ppm, indicated by a blinking ‘x10’ image. • Built-in digital thermometer. • Large and easy-to-read LCD screen display. • Calibrated with a 342 ppm NaCl solution.