Pool PH Meter 0.01 PH High Accuracy Water Quality Tester Features: New and. Excellent meter, very accurate and. With protective plastic case and calibration screwdriver. An ideal instrument for aquarium, fishing industry, swimming pool, school laboratory, food andamp; beverage etc. Specification: Measuring pH Range: 0.0 - 14.0 pH Resolution: 0.1 pH Accuracy: 0.1 pH (at 20°C/68°F), 0.2 pH Operating Temperature: 0 - 50°C (32 - 122°F) Calibration: Manual, 1 point Relative Humidity: andlt;95% Life: Approx.700 hours of use Size: 152mm x 30mm x 15mm (5.9x1.2x0.6") Trimming: By potentiometer Battery: 3 x 1.5v (AG-13 button battery) ( Not included ) Net Weight: Approx. 57g (after installed batteries) Package: 1 x Digital PH Meter Tester Pen 1 x Calibration Adjustment Screwdriver 3 x Button Cell Batteries (Not Included) 1 x User Instruction Manual (English) The way of Calibrate: the electrode in pH6.86 (under 25°C) standard buffer solution of phosphate, and gently the electrode. Note: Please allow 1-3mm errors due to manual measurement. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Dadangjia