No, this isn’t a woodworking marking gauge – it’s for marking metal! The Starrett 29B graduated scratch gauge is the only tool of its kind that I remember seeing, but there might be others. This looks like a woodworking gauge, but it features a hardened steel head and tempered steel square scribe for maximum durability and metalworking applications.
The Starrett gauge is used in a similar manner as a woodworking marking gauge. Adjust the gauge depth along the steel bag, and glide the round head along a workpiece to leave a mark parallel to the edge.
The gauge is 6-inch long and has 1/64″ markings along the entire length. Fine adjustments can be made by slightly rotating the guide wheel.
You could use this for woodworking applications as well, but dedicated woodworking wheel marking gauges are considerably less expensive.
I sometimes use carbide calipers for parallel metal-marking applications, but this looks like it could be a great alternative.
The marking gauge comes with a square scribe that could be rotated to give 4 fresh scratch points. Starrett doesn’t have a part number for the scribe, which means replacements probably aren’t available, but it might be possible to sharpen yourself should you ever dull all four points.
It looks like Lee Valley has the best pricing on this right now.