Darson’s Digital Calipers give extremely accurate measurements for tools and opening with a digital display for maximum accuracy.
When you need to know the exact diameter of a mystery drill bit, the inside opening of a mortise or the precise width of a dado blade, a caliper is the right tool for the job. Darson offers conventional style Digital Calipers in 4″ and 6″ maximum-opening sizes, accurate to 1/128″ or .01mm. You can zero out the tool to take absolute measurements, or zero it once open to take relative measurements. They sell for $28 to $33 and come with a spare battery as of 2011. (Most of these other tools do, too.)
