centimetres
To measure an object smaller than an inch you can use a ruler. Builders often use rulers to measure things smaller than an inch. Or you can use a vernier caliper to accurately measure small things.
If you r are talking about what measurements you use then you use parts of an inch ie 16ths or 8ths or 32nds of an inch.
Click on 'related links' below to see a picture of a vernier caliper.
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Oh, dude, like, a unit of measure smaller than a foot is an inch. It's like, you know, one of those things that's like, smaller than a foot but still kinda useful for measuring stuff. So yeah, an inch is the answer.
Because people sometimes want to measure things that are smaller than an inch, or because they are not a whole number of inches long.
Yes, on inch is 2.54 centimeters, so a centimeter is smaller than an inch.
Half an inch.
1/2 of an inch would be smaller than 3/4ths of an inch.