Moore & Wright Spring Joint Internal Caliper - 100mm (4in)

This caliper is designed specifically for measuring internal dimensions, such as the inside diameter of holes or pipes.

Carefully expand the caliper until its legs lightly touch the inner walls of the object. Then, measure the distance between the caliper legs using a ruler, micrometer, or digital caliper.

It means the caliper has been manufactured and tested to meet the specific quality and performance requirements set by British Standard 3123 for internal calipers.

No, this is an internal caliper and is designed exclusively for measuring the inside dimensions of objects.

This specific model is 100mm (4 inches) in size. Its effective measuring range is slightly less than its maximum jaw opening, and it is best used for internal dimensions within this general capacity.

The bow spring provides consistent outward pressure on the caliper legs, ensuring that they maintain even contact with the internal surfaces being measured, thus improving measurement stability and accuracy.

Ensure the adjustment screw is tightened sufficiently. If the screw feels stripped or worn, it may need replacement or professional servicing.

Verify that the caliper is being inserted and expanded with consistent, even pressure. Ensure the internal surface being measured is clean and free of burrs. Check for any wear or damage on the caliper jaws.

Partially close the caliper before insertion, then expand it gently within the space. The 100mm size is intended for moderately sized internal dimensions; ensure your measurement target is within its range.