Product description Digital pH Meter Water Tester This pH meter is affordable and useful for those who need a PH tester for household and laboratory use.It's not only ideal for household or laboratory use. It's not only ideal for household or laboratory use.It is suitable for testing pH balance of drinking water, pool, aquarium, food Specifications: Updated Version Measuring Range: 0-14.0 PH Resolution: 0.1 pH Accuracy: 0.1 pH (20C) Use Environment: RH 95%, 0-50C ( 32176F ) Battery: 21.5V LR button cell Package Includes:1 x PH Meter lCalibration Tips:Dissolve pH buffer powder in 250ml of distilled water.Turn on pH meter and clean the electrode in distilled water, then immerse the electrode in the pH standard solution.Press 'CAL' button, wait until the reading is the same as the PH value of buffer powder and steady.Clean electrode with distilled water and dry it. Note:Clean the electrode with distilled water Every time before and after useBe careful with the glass probe since it may be a little fragile when you use.Remember to gently wipe it with a clean, soft cloth when you're done before capping it again.Open the battery Case or replace battery, then need to re-calibrate the meter.