Lab Junction TDS Tester/Meter,Digital Pocket Size TDS/Temp. Tester/Meter,Range:0-9990 ppm(mg/L) LJ-653 as per Quality Standards Product Description : TDS Range: 0 - 9990 ppm (mg/L),Temp. Range: 0 - 80 degrees Celsius, Resolution:0-999: 1ppm; 1000-9990:10 ppm (indicated by a 'x10' icon), Temperature Resolution : 0.1degree Celsius (Celsius only), Accuracy: +/- 2%, EC-to-TDS Conversion Factor: NaCl(avg.0.5) ATC: Built-in sensor for Automatic Temperature Compensation of 1to 50 degrees Celsius (33 to 122 degrees Fahrenheit), Power source: 2 x 1.5V button cell batteries (included) (LR44 or equivalent), Battery life:1000 hours of usage, , , TDS : Handheld TDS Meter with Carrying Case With its rugged design and build, the TDS is an ideal meter (tool) that can be used for any application; Ranging from water purification, to hydroponics to industrial waste water treatment. It comes with a black vinyl carrying case, protecting it when carried in a toolbox.