Martel Electronics BetaGauge 321A-Ex - Manual (Page 23)

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