Check the listing for details. HO Scratchbuilders Thickness Gauge Measuring Tool. Color: Silver, Condition: New. Listed at 17.99 USD. Scratchbuilders Thickness Gauge is a multi-purpose measuring tool. The ninety-degree triangular tool contains two compact guides for HO, HOn3 and HOn2 1/2 of Scale inches as well as Fractional inch gauges. Ideal for checking strip wood and styrene stock quickly and easily. Measures from 1” to 18” HO scale inches and from 1/64 inch to 3/16 inch. Just slide the strip into the corresponding slots of the gauge to determine actual thickness. No re-measuring with a caliper or a clumsy ruler. Gauge is cut from durable, high-impact plastic with a silver-colored finish with embossed clear black lettering. Perfect for scratch building and for managing that pesky box of random strip wood and material. A must for any scratchbuilder. Comes in a clear plastic resealable envelope.