Vernier caliper

• lFunction

lTo measure smaller distances

lCan measure up to .001 inch or .01mm.

• lFeatures

lLarger, lower jaws are designed to measure outer points e.g. diameter of a rod.

lTop jaws are designed to measure inside points e.g. size of a hole.

lA rod extends from the rear of the caliper and can be used to measure the depth. 

 

• Structure of Vernier caliper

 

   

• Main Scale

lMain scale is graduated in cm and mm.

l

• lVernier Scale

lIt slides on the main scale.

lOn Vernier scale 0.9cm is divided into 10 equal parts.

l

• lJaws

lTwo inside jaws (Upper)

lTwo outside jaws (Lower)

 

• Least Count

lLeast count (L.C) is the smallest reading we can measure with the instrument.

lL.C = one main scale division – one vernier scale division

L.C = 1mm – 0.09mm

L.C = 0.1mm = 0.01cm

lLeast Count = Value of the smallest division on MS/ Total number of division on VS

L.C = 1mm / 10 = 0.1 cm / 10 = 0.01cm