The Handheld TDS-3 Meter allows you to check the function of your RO membrane and DI resin. The Total Dissolved Solids meter, includes batteries, Comes precalibrated, hold function saves measurements for convenient reading and recording and has an auto-off function. Measurement Range: 0-9990 ppm. From 0-999 ppm, in increments of 1 ppm; from 1000 to 9990 ppm, in increments of 10ppm. Built-in digital thermometer. Factory calibrated with 342 ppm NaCl solution; recalibrate with mini-screwdriver. Automatic temperature compensation.
