Watch as we billet machine Fast Tracks "Trifecta" an HO scale code 70/82 three point track gauge from solid aluminum. Using very specialized miniature tooling we cut these gauges to work with all sizes of rail, from code 40 to code 148. Available online from Z scale code 40 to O scale code 148, finally, one source for precise three point track gauges in all popular scales!
https://www.handlaidtrack.com/trifecta-track-gauge