Measuring range: 0.00-14.00 pH Resolution: 0.01 pH Accuracy: 0.01 pH Batteries: 2X 1.5V LR44 (not included) Automatic temperature compensation: 0-50C (32-122F) Dimensions: 15x2.5x1.3cm / 6x1.1x0.5 inch Net Weight: 52g / 1.83 oz Warm tips: Step 1: Turn on pH meter, clean the electrode in distilled water Step 2: Immerse the electrode in pH 6.86 standard buffer solution Step 3: Press the "CAL" button. Wait until the display reading is 6.86 pH and steady Step 4: Clean the electrode in distilled water and dry it, then immerse the electrode in pH 4.00 standard buffer solution Step 5: Press the "CAL" button. Wait until the display reading is 4.00 pH. Then complete pH 4.00 calibration Step 6: Clean electrode and dry it, place the meter into pH 9.18 standard buffer solution. Check if reading is correct between 9.17-9.19 pH Note: Clean the electrode with distilled water every time before and after use Handle the glass probe with care as it may be fragile Gently wipe it with a clean, soft cloth before capping Recalibrate the meter after opening the battery case or replacing the battery Color: Yellow Material: Plastic Package Contents: 1 x pH Meter 9 x Calibration packets Only the above package content is included; other products are not included Note: Light reflection and different displays may cause the color of the item in the picture to differ slightly from the real thing. Measurement allowed error is +/- 1-3 cm