Waterproof Shell Design: The waterproof rating of the digital ORP meter is IP55, which can effectively prevent the tester from entering water, thus affecting the measurement results. Data Lock Function: The tester is designed with a "HOLD" button for easy saving and recording of measurement data. Advanced Technology: The ORP meter pen adopts advanced technology, high-quality components, and replaceable electrodes, which greatly reduces the size and maintains the original good quality. Wide Application: The ORP detector is widely applicable for the redox system of industrial wastewater, measuring the disinfection effect on swimming pool water, mineral water, and tap water, observing the dynamic changes of ORP in soil, etc. Notice: Faced with conditions such as large indication error, indication value jumps, and the value indication does not return to zero, etc., the following parts of the instrument immersion line should be inserted into alcohol to shake several times to clean the sensor One: Main technical indicators: Measuring range: 0 to 1999mg/LmV Resolution: 1 mV Accuracy: 5 mV Working voltage: 4 x 1.5V (AG-13 battery) Working temperature: 0-50 Calibration: 1 point calibration Volume: 188mm * 35mm * 35mm Weight: 118g Packing weight: 300g Two: Operation steps: 1. Remove the protective cover. 2. Touch the "ON/OFF" switch to turn on the device. 3. Put the electrode into the solution to be tested, shake it gently, and read the displayed value after the displayed value is stable. 4. Press the "HOLD" key to hold the current measured value. If you need to measure again, press the "HOLD" key again to automatically release the hold state. 5. After use, turn off the switch, clean the electrode with distilled water, and put on the protective cover. Three: Notes: 1: There is white crystalline salt around the electrode, which is a normal phenomenon of the ORP electrode. It can be dissolved and disappeared only by immersing the electrode in clean water. 2: When testing the ORP value, it is generally a few minutes to 10 minutes. Wait until the value is stable and beat very slowly or beat up and down to read the displayed value as the measured value. 3: The displayed value of ORP and air jumps randomly, and it is a normal phenomenon that there is no regular change. 4: After use, please turn off the power, clean the electrode with pure water or distilled water, dry the water with a soft paper towel, and put on a protective cover. Battery installation: If the display is blurred or does not display, the battery should be replaced in time. When replacing the battery, unscrew the top cover to replace it, paying attention to the polarity of the battery. Delivered quantity: 1 piecebecomeveryrich