Micrometers are used to measure distances with a highly specific accuracy. In curling, when two stones appear to be very close micrometers are used to determine which stone is ahead of the other. Micrometers can determine distances greater than or equal to 0.001", allowing for curling matches to be incredibly precise. Micrometers are used to avoid ties in rock positioning and they're very useful to curling game play. Matches are dependent on rock positioning, and every short distance matters.
A micrometer consists of the frame, which is a C-shaped body that maintains the anvil and barrel in relation to one another. The frame is thick, and heavy to reduce friction and any unnecessary heating that would disrupt a reading.
Micrometer accuracy is maintained by gauge blocks or rods and the meter should be calibrated at .7500 before measuring. Micrometers are very sensitive as they are intended to measure incredibly small things, because of this keeping them clean is important to micrometer accuracy and functioning. Even a speck of dirt can throw off a micrometer reading.