Mitutoyo 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 0.25" x 0.5"