NMRA 98-1 Standards Gauge HO Scale

This gauge helps you to make adjustments to rolling stock and track to end annoying derailments. It will check for accurate track and switch dimensions, wheel spacing, flange depth, tire width and wobble. Also checks for structure clearance so trains can pass without hitting tunnel portals, station platforms, scenery, etc. This is a precision measuring instrument manufactured of stainless steel by the National Model Railroad Association. Instructions included.