This caliper is four inches long and has a stainless steel construction. It features the ability to read metric or SAE decimal even in harsh conditions. In addition, the easy-to-read digital display allows you to measure and convert from SAE to metric quickly and easily.
Other features include an automatic shut-off and a storage case for easy transport. A very handy tool for measuring things like 400 day suspension springs and clock mainsprings. Provides an accurate reading every time.