Good luck....Aristocraft is out of business, so there is no new stock.
Those are good general purpose gauges, which generaly are close to, or dead on with NMRA standards. I have several of them, and use them continuously.
The "Mysterious thing was that few of the Aristo wheelsets, track or switches was "On" with the gauge they produced.
If some manufacturer was to produce that gauge today, it would be a very useful tool, if everyone used it.
Of course, there is that continous, lingering cry from the "Fools" that seem to populate some Large Scale circles....."We don't need no durned standards".....as they frustrate themselves with faulty gauged wheel sets, track gauge, and coupler heights...causing "Mysterious" derailments and switch/turnout/point problems.....which they are continuously asking advice to solve....go figure.... and yes those same standards apply for LGB equipment too....I wonder why LGB in all their wisdom has never produce the same sort of gauge....