Features1Stored Synchronously Data: The ORP meter can share data or print forms, keeping time and data records synchronously. 2Backlit Control: This digital display ORP meter supports backlit control, long life and performance. 3BT Function: Using sophisticated production technology, it has BT function and supports BT control data recording. 4Wide Uses: Suitable for conventional aqueous solutions, can be used in swimming pools, spas, hydroponics, environmental monitoring, laboratories, etc. 5Replaceable PH Probe: The ORP meter uses a replaceable PH probe, which is strong, durable, and not easily damaged.SpecificationItem Type: ORP MeterMaterial: ABSORP Range: -999mV to +999mVResolution: 1mVTemp. Range: 0.1 to 60.0, 32.1 to 140.0Resolution: 0.1, 0.1Accuracy: 1Calibrated ORP: 256mvTemperature Compensation (ATC): 0.1 to 60.0Working Environment: 0.1 to 80.0, RH: Maximum 90%Battery: 3 x 1.5V LR44 (Battery Not Included)Product Size: Approx. 187 x 37 x 37mm / 7.4 x 1.5 x 1.5inWeight: Approx. 158g / 5.6ozPackage List1 xORP Meter (Battery Not Included) 1 x User Manual