Hanna Digital Waterproof Combo Pen

Hanna's Digital Waterproof Combo Pen is a great way to have both a pH and TDS pen in one. More 'user-friendly' than the Handheld model, this all inclusive pen features a large, dual level LCD screen that displays pH, TDS (in ppm's), and temperature (in both Celcius and Farenheit). It will also tell you the battery level and automatically shut-off and calibrate. Being waterproof, this pen is 100% buoyant. The pH electrode can be replaced individually. [Note: Hanna TDS calibration solution must be used when calibrating TDS. See 'Calibration Fluids' for the correct solution.]