onic indicator Electronic I.D. Caliper O.D Micrometer Caliper Rockwell hardness tester Stereo-microscope Electronic depth micrometer ? Flatness gauge Ring thread gauge Standard plug gauge Blade type caliper Material Analysis Instrument Plug screw gauge Material Analysis Instrument Caliper Surface roughness measuring device Leeb hardness tester Digital force gaugeBore gaugesMicro-image measure4.Materials Tool SteelA2/D2/T4/T5/M2/H13/W-10Alloy Steel4140/42/4130/4137/8620/52100Carbon Steel101