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NMRA Mark III, HOn3 Standards Track Gauge

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NMRA Mark III, HOn3 Standards Track Gauge

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Developed and manufactured by the NMRA (National Model Railroad Association), this HOn3 gauge is an indispensable tool that makes it easy for you to check all critical dimensions of your track and rolling stock.

The HOn3 track gauge can measure:

  • Gauge of track and turnouts
  • Flangeway gauge and depth
  • Wheel gauge
  • Coupler height
  • Points gauge
  • Platform height
  • Tunnel and train clearances

Includes complete instructions.