Attributes . Case: sturdy, corrosion resistant series 304 stainless steel case and bezel; crystal: optically clear, strong glass, gasketed to maintain weather-tight integrity is standard; stem: 304 series stainless steel, welded at tip and case connector to prevent leakage, 1/4" (6.35 mm) diameter is standard; hermetic seal: hermetically sealed per ASME B40.3 external reset: slotted-hex adjustment head offers screwdriver or wrench use to field calibrate the thermometer; bi-metal element: an extremely responsive temperature sensing helix which has been carefully sized and tested, heat treated and aged to relieve inherent stresses and insure continued accuracy; dampening: bi-metal helix is coated with a viscous silicone to minimize pointer oscillation and to improve temperature transmission . Names