Martel Electronics MC1010 - Manual (Page 39)

VAL?
Returns the value of any measurement taking place on the display. For example, if the display
is measuring 10V, then VAL? will return:
1.000000E+01, V
ZERO_MEAS
Zeroes the attached pressure module. Enter the zeroing value in PSI after the command
when zeroing an absolute pressure module.
ZERO_MEAS?
Returns the zero offset or the reference value for absolute pressure modules.
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