Pointer stops of molded rubber prevent pointer over-travel without damage. Full view lens is removable and molded of tough polycarbonate. Aluminum scale litho-printed black on white, enhances readability. Red tipped aluminum pointer , rigidly mounted to helix is easy to see. Wishbone assembly provides mounting for helix, helix bearings, and pointer shaft.
Jewel bearings provide virtually friction-free helix motion.
Helix is free to rotate in jewel bearings. It aligns with magnetic field of magnet to transmit pressure indications to pointer. Zero adjustment screw , located behind the removable lens, eliminates tampering. Range spring calibration clamp fixes live length of spring for proper gage calibration and is factory set and sealed. Silicone rubber diaphragm allows accurate response to a broad range of temperatures and at extremely low pressure.