Determine the ASTM grain size number if 60 grains per square inch are measured at a magnification of 100X. Round your answer to the nearest whole number.

What is the chief metrological difference between measuring with a microscope and with an electronic comparator? a. the microscope is limited to small workpieces.a. the microscope is limited to small workpieces. c. the comparator can only examine one point on the workpiece. d. the microscope carries its own standard.