12AAA222 Mitutoyo SJ-210 and SJ-310 Height Gage AdapterMitutoyo Surftest SJ 210 and SJ 310 Height Gage Adapter This Height Gage Adapter will allow you to mount your Mitutoyo Surface Roughness Tester onto a Height Gage, allowing you to make surface roughness measurements at different heights more accurately and more repeatable. Works with the following Mitutoyo Surftest model SJ 210 Mitutoyo Surftest model SJ 310 Holding Bar is 9mm x 9mm round