Micrometer

English: A micrometer is a widely used device in mechanical engineering for precisely measuring thickness of blocks, outer and inner diameters of shafts and depths of slots.

Micrometer screw plus differential micrometer screw
Depth micrometer with one extra probe
Inside micrometers
5.783mm
5.78mm
0.276inches
for objects in range 175÷200 mm
Gascoigne's Micrometer as drawn by Robert Hooke
old micrometer
old small micrometer
modern micrometer
outside, inside and depth micrometers
micrometer caliper diagram, labeled
Ejs open source Micrometer world best java applet creative commons license
the answer is =main scale + dial scale - (zero error) =4.00 + 0.14 - ( 0.00)= 4.14 mm
the answer is =main scale + dial scale - (zero error) =4.00 + 0.29 - ( 0.15) = 4.14 mm
the answer is =main scale + dial scale - (zero error) =4.00 + 0.05 - ( -0.09) = 4.14 mm