A special alloy is used for the sector gears to provide improved wear resistance Application of a hard coating on the surface of the crystal makes the gauge highly scratch and chemical resistant Secure adhesion between the bezel and crystal as well as the use of an O-ring prevents water or oil penetration The spindle is made of high strength quench hardened stainless steel which resists arduous use A multi-revolution dial indicator suited to general measurement applications. The dual-reading scale aids measurement in both directions, Manufacturer: EDEDE