Do you have a set of gauge blocks which have a cert providing their actual dimensions? The image is just an Ebay image which includes the probe adapter but I do not see the probe or any probe fixturing? You also need a quality surface plate and associated hardware. Starette made similar analog devices as did brown and sharp. If you can find a manual for either of those manufacturers it should include a calibration procedure as long as the ranges are similar. There should be a probe.
OK, cool. Yeah, the manual would point out the individual tweaks. Looking around I couldn't find a manual or procedure specific to that model. Best of luck with it Dana.