Let's play “Name That Tool.” Most people recognize a screwdriver when they see one. The same goes for a hammer, chainsaw and drill. But would you recognize a caliper? How about a bar clamp, bench vise or stud finder? In a 2019 survey of more than 1,000 British people, the U.K. trades directory MyJobQuote found that those four tools were the most difficult to name. FYI: A caliper is an instrument for measuring thicknesses. A bar clamp is used in woodworking to hold large pieces together.