เครื่องวัด pH Type Digital Resolution 0.1 Measure pH Range 0.0-14.0 Durable, accurate and waterproof. The product has been calibrated from the factory and comes with one set of calibrate for future adjustments. Range : 0.0 - 14.0 pH Resolution : 0.1 pH Accuracy : +/- 0.1pH Operatiing Temp. : 0 C - 50 C (32 F-122F) Calibration : 4.01, 6.86, 9.18 Power Supply : 1.5V x 4 (LR44 is included in the set) Weight : 102g (approx.) Product warranty 1 year Parts: หัว sensor วัดค่า pH