The Accud 421 Series internal dial indicators utilize spring-loaded jaws to make constant point contact pressure
to take highly accurate comparison measurements of hole diameters and groove and tube thicknesses. The dial
display provides precise, readable measurements in metric or inches. It is mostly used in conjunction with an
optional setting ring for accuracy.

Internal Digital Calipers are known for their ease of use, accuracy, and versatility. They are commonly used in
manufacturing, machining, and inspection processes to ensure that components meet exact specifications. The
calipers come in a variety of models with different ranges and resolutions, allowing users to select the right
tool for their specific application.

Overall, Internal Digital Calipers are a reliable and essential tool for anyone who needs to measure the internal
diameter of objects with precision and accuracy.

Graduation: 0.01mm

Range: 0mm – 20mm

Accuracy: ±0.04mm

Jaw Length: 60mm

Manufacturer Cat No: 421-020-11