This is the Kadee® Multi-Purpose Coupler Height 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 HO track gauge
4. Movable dowel tests Kadee® Magne-Matic® Uncoupler height
and registers the needed adjustments
Metal gauge body and couplers.
Made in the USA.