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vernier caliper 
Precision instrument for measuring the thickness and diameter of mechanical parts.
main scale
The divisions marked on the vernier to obtain fine measurements of 1/10 or 1/50 mm.
clamping block
Part that chocks the vernier against the part to be measured.
ruler
Graduated instrument ending in a fixed jaw that measures the thickness or diameter of an object.
vernier
Small graduated rule that slides along the ruler and is used to read very precise measurements.
fixed jaw
Tapered part at the end of the ruler that supports the object to be measured; the object is place between the two jaws, which are gently tightened.
fine adjustment wheel
Thumbwheel for making very fine adjustments to the sliding jaw’s position.
clamping screws
Screws that lock the vernier and the clamping block in their final positions in order to preserve the measurement obtained.
vernier scale
The divisions of equal length that are marked on the vernier and constitute the units of measurement.
sliding jaw
Tapered part attached to the end of the vernier that slides along the ruler to the object to be measured.
