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A 3-in-1 digital water quality test kit(TDS,EC & temperature).It is designed to quickly look into water's value of Total Dissolved Solids,Conductivity,and Temperature. Titanium alloy electrode with ATC (Automatic Temperature Compensation) technology, the pen can provide highly accurate testing data with as low as 2% tolerance. Equipped with backlit display,the output data can be well read in dark area Application Field Household Drinking Water Aquariums Swimming Pool RO / DI System Inspection Hydroponics Aquaculture Brewing Chemical Experiment Education Specifications: 1.Measurement Range pH:0.01~14pH EC:1~19999 us/cm TEMP: 0~60.0℃/32.0~140.0℉ 2.Resolution pH: 0.01pH EC: 1 us/cm 3.Accuracy(at 25℃/77℉) pH:0.05 EC:2% TEMP:0.5℃ 4.Battery: 3*1.5V LR44 button cell 5.Time before Auto Power off: 5 minutes 6.Environment: 0-60.0 ℃/(32.0-140.0℉),RH 100% 7. Dimension:183*37*37mm / 7.2*1.5*1.5 in 8. Weight: 90g/3.2oz 9.Housing Material: ABS 10.Electrode Material: Titanium alloy Package Includes: 1 x Test Pen 1 x User's manual 3 x 1.5V LR44 button cell 3 x Calibration Powder