To troubleshoot your pH/mV meter, turn the selector knob to ?OUT? and use the included BNC-to-BNC cable to connect it to the DuoChek.
The Duo-Chek will simulate a perfect pH electrode in pH 4.0 and pH 7.0 buffer mV values. If your meter is not showing the expected mV values, the meter may need to be inspected or repaired.
In pH mode it will provide useful information about the current calibration of your meter, such as the offset or slope data.
You can also simulate ORP readings in the ?700 range.
Small packet of pH 4 Buffer
Small packet of pH 7 Buffer