This digital pen style pH meter is an ideal instrument for aquarium, fishing industry, swimming pool, school laboratory & beverage etc. * Weight: 65g. Size: 15 x 3 x 1.5 cm. Meter with protective plastic case and calibration screwdriver. * Excellent meter, very accurate and durable. Measuring pH Range: 0.0 - 14.0 pH. Resolution: 0.1 pH. * Accuracy: ¡À0.1 pH (20¡ãC), ¡À0.2 pH. Operating Temperature: 0 - 50¡ãC (32 - 122¡ãF). Relative Humidity£º95%. Calibration: manual,1 point.