Product description Water is consumed by the plants and animals we depend on, and we directly consume it ever day. The pH level of water can provide information on potential contamination. This pH meter is 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. Great for kids school science experiments. Test different bottled waters or even your homemade sauerkraut Specifications Measure range: 0.00-14.00 pH Resolution: 0.01 pH Accuracy: 0.01 pH Power supply: 2x1.5V Operating temperature: 0-80 Calibration: two points automatic calibration Dimensions: 6.1 x 1.2 x 0.7in Net Weight: 48g or 1.7oz How to calibrate STEP 1: Turn open pH meter, Clean the electrode in distill water STEP 2: Immerse the electrode in pH 6.86 standard buffer solution STEP 3: Press the ""CAL"" button(3-5 seconds)and then release the CAL button. Wait until the display digital is 6.86 (blinks 3 times) and steady STEP 4: Clean the electrode in distill water and dry it, immerse the electrode in Ph 4.00 standard buffer solution STEP 5: Press the ""CAL"" (3-5 seconds)button. Wait until the display digital is 4.00pH (blinks 3 times)and then release the CAL button. Then complete pH 4.00 calibration Package includes: 1x digital PH meter 1x screwdriver calibration adjustment 1x user manual Warm tips Clean the electrode with distilled water every time before and after us