phPHMETRO PEN BLUELAB Units: pH, °C, °F Range: 0.0 – 14.0 pH 0 -50 °C / 32-122 °F Resolution: 0.1 pH 1 °C / 1 °F Accuracy @ 25°C ±0.1 pH A utomatic Temperature Compensation (ATC): Yes Battery type: 1 x AAA alkaline