Myron L Ultrapen PT2 Hand Held pH Meter and Temperature pen

This instrument is designed to be extremely accurate, fast and simple to use in diverse water quality applications. Advanced features include 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 push a button then dip the pen in the solution. Results display in seconds.