callipers
From Longman Dictionary of Contemporary EnglishRelated topics: Tools, Hospitalcalliperscal‧li‧pers British English, calipers American English /ˈkæləpəz $ -ərz/ noun [plural] 1 TZa tool used for measuring thickness, or the distance between two surfaces, or the diameter (=inside width) of something2 British EnglishMH metal bars that someone wears on their legs to help them walk SYN brace American EnglishExamples from the Corpuscallipers• When he made it big, in the mid-Seventies, Dury was a 35-year-old former art college lecturer in callipers.• Today he can draw it with callipers.