Supports the following standards: ASTM D4972, ASTM D6276 These pH/Temp. Analysis Pens offer a convenient way to measure pH, or the relative acidity or alkalinity of a sample at a given temperature. The pH pen can be completely operated with just one hand, freeing up your other hand to handle samples. Analysis Pen meters can endure consistent use in rugged environments. The electrodes are also replaceable, which extends the meters’ usable life considerably. Equipped with a wrist strap that helps to prevent unintentional dropping, Analysis Pen meters are constructed with an IP67 waterproof design that can prevent water damage when accidentally dropped into liquid. Specifications Measurement Range: 0.00 to 14.00 pH Resolution: 0.01 pH Accuracy: ±0.05 pH Calibration: 3 Points Temperature Range: 0.0 to 99.0°C Weight: .39 lbs.