I get it. But you place a calibrated chart to the plastigauge to get the reading. Do you best to estimate the tenths based on how far it is between .003" and .004" and then go from there. If close to mid point between 3 and 4, then I'd get the .001" over bearings. If close to .003", then run it as is.I just don't have those specialized tools available to me so I have to use plastigauge.
Again, just my opinion. Good Luck!