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Calibration tips STEP 1: Turn on, 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: Repeat like PH 6.86 calibaration Specifications: PH Meter Specifications: Measure Range : 0.00 - 14.00 pH Resolution : 0.01 pH Accuracy : ± 0.01 pH Automatic Temperature Compensation : 0 - 60 ℃ / 32 - 140 ℉ Calibration : Two Points Automatic Calibration Button Button battery: 2 x 1.5V LR44 batteries Dimension:155mm*31mm*18mm Weight:50g TDS EC Temperature Meter Specifications: Button battery: 1 x 3V CR2032 Lock function - makes it easy to read and record, press HOLD button then remove from test solution. 4 Display modes: press SHIFT button: TDS - ppm & °C, EC - µs/cm & °C, TDS - ppm & °F, EC - µs/cm & °F. 5 minute Auto Shut Off feature, so battery won't run down. Measurement Range: Conductivity: 0 - 9990 µs/cm TDS: 0 - 9990 ppm (parts per million) Degrees Celsius: 0.1 - 80.0°C, Fahrenheit: 32.0 - 176.0°F Accuracy: ± 2% Net weight: 55g Size: 154 x 30 x 14 mm Tips:TDS = Total Dissolved Solids, which is any salt, metal or mineral in the water. Package Includes: 1 x PH Meter 1 x TDS EC Temperature Meter 2 x Calibration packets 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. Dry the meter before capping it again. Need to recalibrate the meter if open or replace the battery Avoid soaking test leads into the water. Avoid high temperature and direct sunlight.