The Ohaus Starter pH pen meter provides what should be expected of a small pen meter: simple, fast, straightforward, no-frills yet highly accurate operation time and time again. Withdurable plastic housing, a protective cap that safeguards the sensor and an automatic shutdown feature that preserves battery life, the Starter pH pen meter can endure consistent use in rugged environments. Equipped with a wrist strap that helps to prevent unintentional dropping. The Starter pH pen meter is constructed with an IP67 waterproof design that can prevent water damage when accidentally dropped into liquid. Features a dual display showing the pH value and temperature and 3-point calibration. pH range: 0.00-14.00 with a resolution of 0.01 pH and an accuracy of 0.05 pH. Temperature range: 0.0-99°C with automatic temperature compensation. Powered by 4 AG13 1.5V micro alkaline batteries.