Martel Electronics BetaGauge 321A - 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.