Digital PH meter with LCD display 100% Brand New Weight: 65 gm Size: 15 x 3 x 1.5 cm Excellent meter, very accurate and durable Measuring pH Range: 0.0 - 14.0 pH Resolution: 0.1 pH Accuracy: ±0.1 pH (20°C), ±0.2 pH Operating Temperature: 0 - 50°C (32 - 122°F) Calibration: Manual,1 point This digital pen style pH meter is an ideal instrument for aquarium, fishing industry, swimming pool, school laboratory, food & beverage etc. Check whether the batteries contained in the product has properly placed by removing and inserting again. Calibrate the device using the buffering solution included in the box. Wipe the device with a soft cloth once in every use.