Digital Orp Meter, 0-+/-1999mv Measurement Range,water Quality Tester

Measuring range: 0-+/-1999MVResolution: 1mV; Accuracy: +/-5mVWorking voltage: 4 x 1.5V (AG-13 battery)Working temperature: 0Celsius-60Celsius; Calibration: 1 point calibrationBattery installation: If the display is faint or does not display, the battery should be replaced in time. When replacing the battery, unscrew the upper cover to replace it. Pay attention to the polarity of the battery.Operation steps:1. Remove the protective cover.2. Contact the ON/OFF switch to turn on the power.3. Put the electrode into the measured solution, shake it gently, and read the displayed value after the displayed value is stable.4. Contact the HOLD key to keep the currently measured value. If you need to re-measure, press the HOLD key again to automatically release the hold state.5. After use, press the switch, clean the electrode with distilled water, and put on the protective cover.Matters needing attention:1: White crystalline salt appears around the electrode. This is a normal phenomenon of ORP electrode. It can be dissolved and disappeared only by immersing the electrode in clean water.2: When testing the ORP value, it usually takes a few minutes to about 10 minutes. Wait for the value to stabilize and jump very slowly or up and down when the displayed value is read as the measured value.3: The ORP and the displayed values in the air are jumping randomly, which is a normal phenomenon if they change irregularly.4: After use, please turn off the power, clean the electrode with pure water or distilled water, and put on a protective cover after soaking up the water with a soft tissue.Color:GreenMaterial:ABSSize:185 x 40 x 35mmPackage Contents:1 x ORP Meter (with battery)Only the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.