Take any ruler add a stop and repetitively accurate marks are at your finger tips. This approach has been a tried and true marking method for centuries. The Woodpeckers Rule Stop shown here is...
Locks Solidly Into Place
If you're on the fence about the quality and effectiveness of these rule stops, stop researching because Woodpeckers nailed it with this solidly manufactured rule stop. When it's locked on, it stays in place. Great accessory for their series of rulers