no you need a dial indicator
A machinist such as a lathe operator would use a micrometer caliper for precise measurements of the product he is machining, Also used by designers of precision parts and programmers of precision machines.
That would be .65, as in "The micrometer reads 0.65 on the dial."
If you have to measure the pencil to a couple decimal places i would suggest a micrometer and a dial caliper.
I think you mean a drum micrometer, but I could be wrong. A drum micrometer is really a dial or digital caliper that checks the wear on a break drum on a car. The wear on a drum is on the inside of the drum and is checked by the ID (inside diameter) with the tool, a micrometer for the most part checks the OD (outside diameter) of something. The most accurate way of testing ID is with a spring loaded pin rod, then check the pin distance with a micrometer.
You would need a brake lathe and a micrometer. Use the micrometer to measure the thickness and then if there up to spec, use a brake lathe. Or simply just take them to your local parts dealer or mechanic (costs around $15.00) + I always get a second opinion on the "micrometer" interpretation by the shop- most want to sell a rotor and err on the side of loss of thickness. NAPA turns them for $5.00. Depending on your locale I am guessing you use different terminology... yet "turning" rotors is generally the term in the south. 2Dynamic
It is possible and often done. The best way to do it though would be to grip the rotor in a way that both sides can be machined without removing it from the lathe before its done. It will have to be set-up and aligned with a dial indicator from the inside faces of the hub.
The caliper and micrometer use a dial or digital readout to measure the distance between the tips. The tolerances of these tools can be under .001 inch, making them extremely accurate.
A micrometer is equal to exactly 1 micrometer.
micrometer
Micrometer
Richard micrometer.