I would suggest aquiring a set of vernier calipers (mine are
electronic). Comparing sizes between wire and drill bits becomes
very simple. I use my calipers everytime I make something.
What you want to look for is either a dial or electronic
caliper..... A vernier caliper uses a set of scales against each
other to provide the measurement... Think of a slide rule (remember
those?) to get a picture sort of how you read it....
The dial or the electronic caliper provides a much more user
friendly readout...although the vernier setup can provide greater
precision and repeatabilty...
The electronics offer the ability to switch back and forth between
metric and English measurement...(which is a true boon for anyone
into gemstones and jewelry)...
Prices start at about $20 more or less and go up....
Gary W. Bourbonais