measuring and setting the angles

ink work on drawings

drawing horizontal lines

drawing parallel lines at inclination

functional dimension

feature dimension

un-necessary dimension

chain dimension

converts pressure into electrical output

converts strain to electrical output

converts linear displacement to electrical signal

all of these

size and shape of the model

perspective features of the model

shading used to render the model

all the above

to measure screw threads

to measure angles

to measure cylindrical bores

to measure spherical holes