An electronics engineer wanted to order a multimeter with a PSI faceplate. Does anyone know what it is ?
closed as off topic by Robusto, tchrist, James McLeod, Lynn, nohat♦ Feb 21 '13 at 7:16
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Additional context is needed to say for sure, but without that context one may surmise it is a faceplate for a moving-coil meter (ie, having a d'Arsonval movement) calibrated to read out in pounds per square inch. For example, if the meter were used in conjunction with a pressure module (eg a Crystal Engineering H20/PSI unit), one could read pressure directly via the scale on the faceplate.