1.Equipped with a highsensitivity probe, rapid response, realize more accurate measurement. 2.Using LED digital display, the measurement result can be displayed intuitively, easy to operate. 3.3 modes: temperature, calibration, locking, use automatic temperature compensation to reduce chip error. 4.Powered by largecapacity button battery, low power consumption, stable performance and long service life. 5.Widely used in water purification systems, hydroponics, aquaculture, swimming pools, aquarium, etc. Condition: 100% Brand NewItem Type: Water Quality TesterMaterial: PlasticModel: ORP-100Measuring Range: -1200 - 1200MVMeasurement Accuracy: +-2mvResolution: 1mvTemperature Compensation: Automatic Temperature Compensation (ATC)Calibration: 7 Seconds Built-In Automatic CalibrationAccuracy: TEMP+-0.5Resolution: TEMP: 0.1Power Supply Mode: 3x1.5V (LR44)Standby: Automatic Shutdown in 10 MinutesLock: Manual Key LockBattery: 3 x LR44 Button Battery 160mAhProduct Size: Approx. 187x37x37mm / 7.4x1.5x1.5in 1 x Water Quality Tester 1 x English Manual 1. Please allow 0?2 cm error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.