TK Custom does not sell or stock this item but, is only providing a link where it is available from Amazon.

Digital Dial Caliper 
Click blue link above to go to Amazon

The digital calipers give a direct reading of the distance measured with high accuracy and precision. They are functionally identical, with different ways of reading the result. These calipers comprise a calibrated scale with a fixed jaw, and another jaw, with a pointer, that slides along the scale.

Use to measure our moonclips and mandrels. Just a good investment for the hobby.

Neoteck 6 inch Digital Caliper and Feeler Gauge Set, Stainless Steel Electronic Vernier Caliper Fractions/inch/Metric Conversion.