Router Bit Depth Gauge
You're all set to rout V-groove into a piece of expensive stock.
How can you be sure the depth you've set is the depth the router
Simple. Check it with this handy router depth gauge. The guide
is clearly marked in 16ths from 1/8" through 1" ...you'll set and
check 15 depths precisely, without wasting material and time
doing it by "trial and error"