pHep(r), the standard in pH measurement with 0.1 pH accuracy, has 2 point calibration, large LCD, pull out replenishable junction and 700 hour battery life. The pHep(r) pH tester features a casing that is more rugged and has been ergonomically enhanced to better fit your hand. The pHep(r) comes with a protective cap that can be used as a measurement vessel. The electrode is replaceable by the operator. With the latest innovation of a non-clogging fiber junction the new pHep(r) meters last much longer. Calibrates on 7.0 and 4.0 solutions.