Martel Electronics DPC300A - Manual (Page 26)

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5. Use "SELECT" to scroll through the "UNIT" options, and select
"NEXT" to move on.
6. Use the arrow keys to set the upper limit of the measuring range;
select "DONE SET" when finished.
7. Use the arrow keys to set lower limit of the measuring range, and
select "DONE SET" when finished. The "%-ERROR" mode will be
ready to use.
The lower and upper limit of the measuring range will be
saved in non-volatile memory until they are changed again
by the user for the internal sensors and the external
pressure modules.