The cutting wheel on these gauges starts and marks smoothly, without having to worry about attack angle and without tearing during cross-grain marking. The hardened steel wheel is ground sharp with the bevel on the inside, so it naturally pulls the gauge tight against your stock and resists following uncooperative grain.
The latest wheel marking gauges from Veritas include a clever micro-adjusting wheel. Simply tighten the collet on the bar, rotate the fence body to adjust the measurement, tighten the thumbscrew, and you're ready to work.