New Ariic Digital PH Meter Tester Pool Water LCD Monitor Pen Aquarium Brand New and High Quality. ?An ideal instrument for aquarium, fishing industry, swimming pool, school laboratory, food & beverage etc. ?Excellent meter, very acurate and durable. ?With protective plastic case and calibration screwdriver. Specification: ?Measuring pH Range: 0.0 - 14.0 pH. ?Resolution: 0.1 pH. ?Accuracy: 0.1 pH (20C), 0.2 pH. ?Operating Temperature: 0 - 50C (32-122F). ?Relative Humidity: &lt;95%25. ?Life: approx.700hours of use. ?Calibration: manual,1 point. ?Power: 3 x 1.5V(AG-13 button battery)(included). ?Size: 15.2cm x 2.8cm x 1.5cm. Package Included: ?1 x Digital PH Meter Tester Pen Aquarium