On30 Scale Height Gauge with On3 Coupler

On30 Coupler Height Gauge with On3 Coupler Multi purpose gauge. Four tools in one. 1. Provides instant visual reference of proper coupler height. 2. Accurately measures proper trip pin height above rail. 3. Built-in track gauge. 4. Movable dowel tests Kadee® Magne-Matic® Uncoupler height and registers the needed adjustments. WARNING: CHOKING HAZARD - Small Parts - Not for children under 14 years. Kadee Quality Products Co. products are not toys and are not intended for children under 14 years old.