Specify which color and portion of scale to be covered with each. Provides undistorted viewing of pointer and scale. Precision scale, litho-printed on aluminum, is accurate and easy to read. Red tipped pointer of heat treated aluminum tubing is easy to see. It is rigidly mounted on helix shaft.
Pointer stops of molded rubber prevent pointer over-travel without damage.
Samarium cobalt magnet mounted at end of range spring rotates helix without mechanical linkages. Sapphire bearings for helix are shock- resistant mounted. They provide virtually friction-free rotation for helix. Rotation is damped with high viscosity silicone fluid. Helix is precision milled from an alloy of high magnetic permeability, deburred and annealed in a hydrogen atmosphere for best magnetic qualities.