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: 0-50Centigrade(32-122It) Dimensions: 15x2.5x1.3cm/6x1.1x0.5 inch Net Weight: 52g/1.83 oz Warm tips It STEP 1: Turn open pH meter, Clean the electrode in distill water It STEP 2: Immerse the electrode in pH 6.86 standard buffer solution It STEP 3: Press the "CAL" button. Wait until the display digital is 6.86pH and steady It STEP 4: Clean the electrode in distill water and dry it, immerse the electrode in Ph 4.00 standard buffer solution It STEP 5: Press the "CAL" button. Wait until the display digital is 4.00pH. Then complete pH 4.00 calibration It 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 Note: It Clean the electrode with distilled water every time before and after use It 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. It Open the battery case or replace battery, then need to recalibrate the meter Batteries (not included ) Colour:yellow Material:plastic Package Contents: 1 x PH Meter 9 x Calibration packets Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.