Specification: Measure Range: 0.00-14.00 pH Resolution: 0. 01 pH Accuracy:±0.01 pH Backlight Time: 20seconds Automatic temperature compensation: 0℃-80℃ (32℉-176℉) Button battery: 2X 1.5V LR44 (included) Product dimensions: 15.5×3.1×1.8cm/6.1×1.2×0.3 inch Weight: 50g How to use Step 1: Remove the protective cap Step 2: Clean the electrode in distilled water and dry it Step 3: Turn the meter on by pressing the ON/OFF key Step 4: Immerse the pH meter electrode in the solution to be tested Step 5: Stir gently and wait for the display stabilizes Step 6: After finished, clean the electrode in distilled water and turn the meter off by pressing the ON/OFF key Note: 1. Don't touch the electrode by hard tools or fingers. Always replace the protective cap to keep electrode from drying out. 2. Clean the electrode every time before and after using. 3. When the meter cannot be turned on or the display fades, open the battery case and replace battery (pay attention to the polarity), then need to recalibrate the meter. Package Incluede: 1 x PH Meter 1 x Carrying case 1 x User's manual 6 x Calibration packets If you have any problems in use, you can always refund within 2 years
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