Omega PCL340 - Manual (Page 24)

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4. LOOP POWER can be toggled on/off, select NEXT when done.
5. Use SELECT to toggle through the UNIT options, and select NEXT
to move on.
6. Use the
↑
and
↓
arrows to set the 100% point of the desired
pressure range, select DONE SET when finished.
7. Again, use the arrows to set 0% point and select DONE SET when
finished and the %ERROR mode will be ready to use.