Attributes . Case: 304 stainless steel case, hermetically sealed; crystal: extra heavy polycarbonate crystal; stem: 304 series stainless steel; external reset: hex nut on back of case; bi-metal element: responsive actuation by bi-metal helix; dampening: bi-metal helix is coated with a viscous silicone to minimize pointer oscillation; scale length: approximately 2-1/8" (54mm); carrying case: polyethylene case with clip . Names