calipers
noun [ plural ] uk/ˈkæl.ɪ.pəz/ us/ˈkæl.ə.pɚz/
(TOOL)
(UK also callipers)测径器，卡钳，双脚规
a device for measuring widths or distances, consisting of two long, thin pieces of metal fixed together at one end
(LEG SUPPORT)
UK (US braces)（装在有行走障碍者腿上的）双脚规形夹
metal supports that are fastened to the legs of people who have difficulties with walking