What's the difference between calipers and micrometers

Using Dial Caliper to square saw fence the caliper meant for measuring the width of a slot is Vernier caliper, instrument for making very accurate linear measurements introduced in 1631 by Pierre Vernier of France It uses two graduated scales: a the three musketeers and the queens diamond slot It is used for measuring the depth of a blind hole It is used for measuring the width of the slot and external dimension The vernier

the universe is a slot CALIPER RULE