micrometer gauge - a U-shaped length gauge in which the gap between the measuring faces is adjustable by an accurate screw whose end forms one face. The gap is read off a scale uncovered by a thimble carried by the screw, and by a circular scale which is engraved on the thimble., esemete lineaarmõõtmete täpseks määramiseks kasutatav kruvivarvaga universaalmõõteriist