Myron L 6Psi and 4P - Manual (Page 53)

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NOTE: FOR COMPLETE INSTRUCTIONS ON MEASURING ORP,
REFER TO MEASURING ORP, PG. 10, IN ThE OPERATION
MANUAL.
To change the ORP measurement format preference:
1. Press .
2. Press and hold for approximately three seconds.
The current preference for ORP units of measure is displayed.
Factory setting for this preference is mV. (Shown below in
Figure 36.)
4. Press the or keys to toggle between mV and
ppm free chlorine measurement format. The setting chosen is
displayed (ppm shown as example in Figure 37).
5. Press any parameter key to exit ORP unit preference
selection or let the unit time out. ORP unit preference will be
saved.
mV
Figure 36
PPM
Figure 37