Weems & Plath Chrome Endurance 085 Barometer All instruments in the Endurance collection have a maintenance-free, ultra-hard finish guaranteed to never tarnish. The patented Slide-N-Lock mounting system eliminates the need for visible mounting screws and allows for easy removal for adjustments to the movement. This barometer is weatherproof and designed for outdoor use. Beveled glass crystal O-Ring seated behind glass for weatherproof construction Temperature compensated fully adjustable aneroid movement Inch and millibar scales displayed Calibrated for altitudes to 3500' above sea level Lifetime warranty on finish and movement United States Patent #8,925,381 Diameter: 3 3/8" Weight: 0.65 lb.