1、Water quality meter is dust‑proof and splashing‑proof, and meets the IP67 waterproof rating. 2、Probe with plug‑in design can be disassembled and replaced to prevent accidental damage to the probe. 3、Water quality monitor will automatically power off if not used in five minutes, saving power and worry. 4、The measurement range is 1‑9990ppm, and the resolution is 1ppm. The test error is small. 5、0‑60℃/32‑140℉ automatic temperature compensation, which has a certain influence on the test. 1 x Water Quality Test Pen (Battery Not Included)1 x Manual  Item Type: Water Quality TesterMaterial: ABSProduct Size: Approx. 183x37mm / 7.2x 1.5inBattery Information: 3 x LR44 battery (battery not included)PH Detection Range: 0.00- 14.00pHPH Resolution: 0.01pHError: ± 0.05pHTDS Detection Range: 1-9990ppmTDS Resolution: 1ppm; 0.1pptError: ±2%F.SORP Detection Range: 0~±1000mVORP Resolution: 1mVError: ±2mVEC Detection Range: 0~19990us/cmEC Resolution: 1us/cm; 0.1ms/cmError: ±2%F.STemperature Detection Range: 0-60℃/32-140℉Temperature Resolution: 1℃/℉Error: ± 0.5℃Waterproof Rating: IP67Working Environment: 0-60℃ (32-140℉); RH100%Automatic Shutdown Time: 5 minutesWeight: Approx. 151g / 5.3oz