Combination pH & ORP Meter

The Combination pH & ORP Meter houses two measurement circuits and accepts a dual-function electrode that switches between pH and ORP modes at the press of a button. This eliminates the need to carry two separate instruments when monitoring both parameters simultaneously — a common requirement in reef aquariums running ozone or UV sterilisation.

The meter delivers ±0.01 pH accuracy after two-point calibration and ±1 mV ORP resolution. Automatic temperature compensation is applied to pH measurements; ORP readings are absolute mV values not requiring temperature correction. The waterproof housing withstands accidental splashing and brief immersion.

The unit is compatible with standard BNC combination electrodes and includes one dual-function probe. Two-point pH calibration using 4.01 and 7.00 buffers is performed via front-panel buttons with on-screen prompts.