Digital PH Meter Water Tester 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 (included) Automatic temperature compensation: 0-60Centigrade Dimensions: 15x3x1.3cm Net Weight: 52g/1.83 oz Precautions: Please note that the PH pen probe is a glass product and is a fragile product. Please do not collide with things. Once the damage is not replaceable, you must protect the probe. After use, use absorbent paper to gently absorb the water on the probe. Matters needing attention: PH meter has been calibrated before delivery, the buyer does not need to re-calibrate after receiving the goods! In the following cases, the PH meter must be re-calibrated: 1. Has been used for a long time after calibration; 2. Special electrode use Frequently; 3. The measurement accuracy requirements are relatively high. Standard configuration 1XPH meter with opp bag 2X LR44 Button batteries 2X calibration powder 1X instruction manual