This instrument is designed to be extremely accurate, fast and simple to use in diverse water quality applications with dip or scoop sampling for measurements in standing bodies of water and vertical streams. Advanced features include the ability to choose between snapshot and continuous measurement modes; 1, 2 and 3 point calibration for superior accuracy; automatic temperature compensation; fully encapsulated electronics; proprietary sensor construction; highly stable microprocessor-based circuitry; and waterproof housing. A true one-handed instrument, the PT2 is easy to calibrate and easy to use. To take a measurement, you simply push a button then dip the pen in solution. Results display in seconds.