Why Choose Our PH Meter? 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 the PH balance of drinking water, pool, aquarium, and food Specifications. Specifications: Updated Version Measuring Range: 0-14.0 PH Resolution: 0.1 pH Accuracy: ±0.1 pH (20 °C) Use Environment: RH 95%, 0-50Degree C ( 32～176Degree F ) Power Supply: 2x1.5V (LR44 Button cell) (Included) Calibration: tow points automatic calibration Dimension: 15.5cmx3.1cmx1.8cm Weight: 50g Calibration Tips: 1. Dissolve PH buffer powder in 250ml of distilled water. 2. Turn on the PH meter and clean the electrode in distilled water, then immerse the electrode in the PH standard solution. 3. Press the' CAL' button, and wait until the reading is the same as the PH value of buffer powder and steady. 4. Clean the electrode with distilled water and dry it. Package Includes: 1 x PH Meter 3 x Calibration packets 1 x Carrying case 1 x User's manual Note: Clean the electrode with distilled water Every time before and after use. Be careful with the glass probe since it may be a little fragile when you use it. Remember to gently wipe it with a clean, soft cloth when you're done before capping it again.