Steel Rule
These are made up of stainless steel and are available in
many sizes ranging from 1/2 ft. to 2 ft. These are marked in inches or
millimetres. All the faces are machined true. The edges of steel rule should be
protected from rough handling.
Calipers
These are generally used to measure the inside or outside
diameters. Different types are:
>Outside Caliper: It is used to measure the outside
dimensions.
> Inside Caliper: It is used to measure the inside
dimensions.
> Spring Caliper: Spring is provided to apply the pressure
and lock nut is provided to lock any desired position.
> Hermaphrodite, Jenny or Oddleg Caliper: One leg is bent
at the tip inwardly and the other has a straight pointed end. It is used to
scribe lines parallel to the straight edges.
> Vernier Caliper: It is used for measuring the outer
dimensions of round, flat, square components and also the inner size of the
holes and bore. A narrow blade is used to measure the depth of bar slots etc.
The reading accuracy in metric system is 0.02 mm and British system it is
0.001”. It is made of stainless steel.
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