Rang: 0-9990ppm Accuracy: +/-2%Battery: 2 x 1.5V Button Cell battery (included)Item size:155mm x 31mm x 21mmFeatures: 1. 100% Brand new and high quality. 2. This item can be used in: water purifiers and filters， food (vegetable， fruits) & drink quality monitoring， pools and spas， aquariums， hydroponics. 3. Hold function: Saves measurements for convenient reading and recording. 4. Auto-off function: Turns off meter after 10 minutes of non-use to conserve batteries. 5. Dual Range: Measures form 0-999ppm， with a resolution of 1ppm. From 1，000 to 9，990ppm， the resolution is 10ppm， indicated by drinking x 10image， Factory calibrated.Package Included: 1 * TDS Meter Tester 1 * User Manual 1 * Leather Case