Greisinger-GMH-3551-p H-ORP-Temperature-Meter-with-Data-Logger-Greisinger-GMH-3551-p-The-b-GMH-3551-b-is-a-handheld-meter-that-is-designed-to-carry-out-measurements-of-b-p H-b-levels-b-Redox-b-ORP-b-r H-b-levels-&-b-temperature-b-The-meter-carries-out-standard-or-m V-sub-H-sub-measurements-in-ORP-mode-that-allow-for-automatic-conversion-to-hydrogen-system-electrodes-Calculation-of-the-r H-value-is-by-means-of-an-ORP-measurement-&-by-manual-entry-of-p H-value-or-use-of