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❤ DOY Digital PH Meter☞ If you ever needed a super convenient pH meter that can be carried anywhere and used in a snap, this is it. ❤ Specifications:☞ Measure range: 0.00-14.00 pH☞ Resolution: 0.01 pH☞ Accuracy: 0.01 pH☞ Power supply: 2*1.5V (LR44 Button cell)☞ Operating temperature: 0-80℃☞ Calibration: two points automatic calibration☞ Dimensions: 155mm*31mm*18mm☞ Net Weight: 50g/1.70z❤ How to use:▼ 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. Wait until the display digital is 6.86pH 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"" button. Wait until the display digital is 4.00pH. Then complete pH 4.00 calibration▼ STEP 6: Clean electrode and dry it, put the meter into PH 9.18 standard buffer solution. Check if reading is correct between 9.17-9.19pH❤ Package Includes:☞ 1 x PH Meter☞ 3 x Calibration packets☞ 1 x Carrying case☞ 1 x User's manual❤ Warm tips:☞ 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.☞ Remember to gently wipe it with a clean, soft cloth when you're done before capping it again.☞ Open the battery case or replace battery, then need to recalibrate the meter❤ NOTE: ☞ Please read the manual carefully before use the pH meter!!!