Oakton EcoTestr pH1 Waterproof Pocket Tester The economical, simple-to-use pH tester measures pH levels and temperatures quickly, displaying them both simultaneously on a large dual-line LCD. It has a pH range from 0 to 14 with an accuracy of ±0.1 pH. The tester features up to three pH calibration points with auto NIST and US buffer recognition. Additional features include a long-lasting durable electrode with polymer reference electrolyte; status icons for measurement stability, calibration, battery life; and self-diagnostics. The IP67-rated housing features an easy-to-grip design and floats if accidentally dropped in water when sensor cap is on. The tester, powered by four AAA batteries, can operate up to 400 hours continuously. Leakproof cap with fill line functions as a sample/calibration and hydrating cupAuto shutoff extends battery life Item number 35634-05 includes plastic storage case, lanyard, and four AAA batteries. Specifications Min/Max pH 0/14 pH Resolution 0.1 pH pH Accuracy ±0.1 pH Buffer Recognition USA and NIST Calibration Up to 3 points Min/Max Temperature 0/50 °C (32/122 °F) Temperature Resolution 0.1 °F/°C Temperature Accuracy ±0.5 °C (±0.9 °F) Waterproof Yes Battery AAA (4) Battery life 400 hrs Dimensions (L x W x H) 7 x 1.5 x 1.2 in. Probe Included Yes