GYZJ-078 test disk for use with hardness tester GYZJ-934-1
The GYZJ-078 test disk stamped 43-48 is used to calibrate the lower range of the GYZJ-934-1 hardness tester
GYZJ-078 test disk for use with hardness tester GYZJ-934-1
The GYZJ-078 test disk stamped 43-48 is used to calibrate the lower range of the GYZJ-934-1 hardness tester