26 MEASURING TOOLS-NAMELY, SNAP GAUGES, THREAD GAUGES AND MICROMETERS; AND MEASURING INSTRUMENTS-NAMELY, INDICATOR GAUGES FOR EXTERNAL MEASUREMENTS, INDICATOR GAUGES FOR INTERNAL MEASUREMENTS, INSPECTION GAUGES, INSIDE DIAMETER CHECKING INSTRUMENTS, WIDTH MEASURING INSTRUMENTS, CONCENTRICITY MEASURING AND CHECKING INSTRUMENTS, RIDER INSTRUMENTS FOR CHECKING OUT-OF-ROUNDNESS AND DIAMETERS OF CYLINDRICAL PARTS DEPTH GAUGES, MICRO HARDNESS TESTING INSTRUMENTS, SURFACE FORM TESTING INSTRUMENTS, SURFACE FINISH TESTING INSTRUMENTS, FLATNESS CHECKING INSTRUMENTS, SPHEROMETERS, EXTENSOMETERS (FOR MEASURING CHANGES IN LENGTH) AND LOAD TESTING INSTRUMENTS