The Myron L Ultrapen PT2 instrument is designed to be extremely accurate, fast and simple to use in diverse water quality applications. Advanced features include the ability to select from 2 different measurement modes (real-time and stabilized), automatic temperature compensation, highly stable microprocessor-based circuitry, user-intuitive design and waterproof housing. A true, one-handed instrument, the PT2 is easy to calibrate and easy to use. To take a measurement, you simply press a button then dip the pen in solution. Results display in seconds.