AMAZECARE Digital PH Meter, PH Meter 0.01 PH High Accuracy Water Quality Tester with 0-14 PH Measurement Range for Household Drinking Water,Aquarium,Swimming Pools (white) Digital pH Meter

Please note: 1. Clean the electrode with distilled water before and after each use. 2. Do not touch the electrodes with hard tools or fingers. Always put on the protective cap to prevent the electrode from drying out and damaging it. 3. When measuring, the depth of the PH meter probe inserted into the water should not exceed the length of the PH pen cap to prevent damage to the circuit board. 4. When the meter cannot be turned on or the display fades, please open the battery box and replace the battery (pay attention to the polarity), and then recalibrate the meter. 5. When calibrating each package of calibration powder, add distilled water no more than 250ML, too much water will easily cause errors. 6. Store the PH meter in a cool and dry place to prevent damage caused by moisture. 7. If you have white crystalline residue near the fill cap or on the electrode, there is no need to worry. These crystals are simply electrolyte salt that has dried. If the pH sensing glass and junction are still hydrated, just rinse down the electrode with deionized or distilled water.