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Coupler Height Gauge For HOn3 Equipment by Kadee Quality products / HO Scale A multi-purpose gauge to assure uniform and consistent performance of Kadee couplers. Five tools in one: 1. Provides instant visual reference of proper coupler height. 2. Gauges car underbody height from rail. 3. Gauges track width. 4. Gauges wheel width. 5. Uncoupler gluing jig.