Ph Meter Digital 0 01 High Precision Water Quality Tester With 0-14 Measurement f26 PH Meter Digital 0 01 High Precision Water Quality Tester with 0-14 Measurement Range ph Metro for Aquarium Swimming Pool Note:the battery calibration powder not included,hope for your understing It's not only ideal for household or laboratory use, also suitable for testing pH balance of drinking water, pool, aquarium, food Project, RO system, Spa, or hydroponics Specifications: Measuring range: 0 00-14 00 pH Resolution: 0 01 pH Accuracy: 0 01 pH Batteries: 2X 1 5V LR44 Automatic temperature compensation: 0-50Centigrade(32-122It) Dimensions: 15x2 5x1 3cm\/6x1 1x0 5 inch Net Weight: 52g\/1 83 oz Warm tips It STEP 1: Turn open pH meter, Clean the electrode in distill water It STEP 2: Immerse the electrode in pH 6 86 stard buffer solution It STEP 3: Press the \