Parker SensoControl Serviceman SCM-150 Mode D'emploi page 12

Press the MAX or MIN button if the maximum or
minimum value is shown.
Delete the memory with the RESET button.
The hold function freezes the momentary
measured value in the display when the HOLD
button is pressed.
The differential value of Input 1 minus Input 2
appears in the display when the button 1-2 is
pressed (use the same sensors).
Selection of units
Set as follows:
Press the "RESET" key and switch on the
SCM-150. "Unit" is displayed.
Change unit for pressure using the
"MAX/MIN" keys.
Press the "HOLD" key to set the unit.
Also change settings for flow, temperature
and RPM.
Then the device goes into measurement
mode.
Attention:
If the display for PSI is flashing, then multiply
value by 1000.
Neutral balance for differential value
measurements
Switch on device and connect the same type
sensors to input 1 and 2.
Press button 1-2. INP1-INP2 is displayed.
Press button 1-2 and the RESET button at
the same time until the display shows zero.