Coupler Gauge Prevents Derailments and False Uncoupling of Model Train

• Check coupler, knuckle and trip pin heights
• Prevents derailments and accidental uncoupling of scale model trains
  
• Meets NMRA published standards
• Forged from machined aluminum
• Works with all brands of HO standard gauge couplers, Bachmann On30 and others.

The Micro-Mark Coupler Gauge ensures your HO, OO and On30 coupler and related component heights are to gauge. This finely machine aluminum gauge when used correctly, can prevent derailments and false uncoupling of model trains. Check coupler, knuckle and trip pin height for conformance to published NMRA standards. Compatible with all brands of HO standard gauge couplers, Bachmann® On30 couplers, and others. Made of machined aluminum. Simple to use.