6-12mm/0.24-0.47" IP54 Digital Three Points Internal Bore Micrometer Set - 3127 Series (Insize)The Insize 3127 IP54 waterproof Digital Internal 3 point Bore Micrometer Set for use around machine fluids and coolants. Made with carbide measuring faces and supplied with ratchet stop create a micrometer which guarantees quick and efficient repeatable measurements. With optional data output measurements rangee up to 300mm (12). Resolution 0. 001mm 0. 00005". IP54 waterproof. Button function: on off, set, mm inch, ABS INC. Data output. SR44 or LR44