Handheld pH meter provides a compact, quick, and handy way to manage the success of your crops to ensure maximum uptake of nutrients. A key parameter that affects nutrient uptake is whether your solution is acid or alkaline - this is measured in the pH. Measures pH and temperature, with selectable units for temperature. The meter is fully waterproof, has a backlit LCD display, double-junction probe (not replaceable), a hold reading function, and has automatic temperature compensation. Simple two point calibration process with 30 day calibration indicator. Other features are a low battery indicator, auto-off function, and a AAA replaceable battery is included.