Square India Stone on Wooden Base, Indian Micrometer Engineers Marking Blue This gauge is used for

This gauge is used for taking the internal diameters of objects of all shapes

Relative humidity: Less than 90%

Base: 210 x 50 x 22mm

also can test transistor

For use in ultrasonic tanks and rotary cleaning machines

Square India Stone on Wooden Base, Indian Micrometer Engineers Marking Blue This gauge is used forNorton Abrasives India oil stones, "sharp and quick"; Combination bench stones have been proven effective for all sharpening requirements, established in 1823 and were Americas first and oldest sharpening stone manufacturer. Pre oiled the surface using 3 in 1 Honing Oil (code 8690) for the best results.; After sharpening your gravers on a sharpening stone use a "Touch Stone" to achieve a mirror finish, a better way than using conventional abrasive