Displays TDS level of triple water line.Highly efficient and accurate due to its advanced microprocessor technology.Auto-Off function conserves battery power. The unit shuts off automatically after 10 minutes of non-use.Wide Range 0-9990 ppm (From 0 - 999 ppm the resolution is 1 ppm. From 1000 to 9990 ppm, the resolution is 10 ppm, indicated by a blinking 'x10' image.)Factory Calibrated:our meters are calibrated with a 342 ppm NaCl solution. Meters can be recalibrated with a mini-screwdriver.TRM1 Triple TDS Meter with three probes.Comes equipped with Mur-lok Quick-Connect T-fitting (14 inch standard, also available in 38inch or 12inch ).Installs quickly and easily.Specifications:Range:0-9990 ppmAccuracy:2%Conversion Factor:NaCl (avg. 0.5)Cable Length:24.5inch (including sensor)Fittings:14inch standard, also available with 38inch or 12inchPower source:2 x 1.5V button cell batteries (LR44 or equivalent; not included)Battery life:approx. 1000 hours of continuous useTips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect UseColour:Photo ColorMaterial:plasticPackage Contents:1 x Water Quality Purity TesterOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +- 1-3cm.