The NMRA (National Model Railroad Association) sets the standards that make model trains from different manufacturers actually work together — common wheel profiles, track gauge tolerances, coupler heights, clearances. The NMRA Standards Gauge is the pocket-size precision tool that lets you verify any of those measurements without arguing with a ruler.
We stock the full NMRA Standards Gauge range. The #1 HO Scale gauge is the most-used: it checks HO track gauge, wheel gauge, flangeway gauge and depth, coupler height, points gauge, platform height, and tunnel and train clearances on standard-gauge HO equipment. The #8 N Scale gauge does the same for 1:160 modelling. The #2 HOn3 Scale gauge is for HO 3-foot narrow gauge (Colorado prototypes). The #5 O Scale gauge covers 1:48 modelling.
Every serious modeller eventually owns the NMRA gauge for their scale — it's the difference between guessing whether a turnout's gauge is in spec and knowing. Pair the NMRA gauge with the Micro Engineering 3-Point Track Gauge for laying flex track, our Track collection for the track you're checking, and Hobby Tools for the rest of the workshop kit. Ships from Oakville, Ontario. Free shipping on orders over $250.
