The Chrome Endurance 125 Barometer delivers accurate, easy-to-read pressure readings in a rugged, marine-ready design for reliable weather monitoring. Aneroid barometer movement: temperature-compensated and fully adjustable with inch and millibar scales Calibrated performance: standard movement set for altitudes up to 3,500 ft above sea level Maintenance-free chrome case: ultra-hard finish guaranteed to never tarnish Weatherproof build: beveled glass crystal with O-ring seal for dependable outdoor installation Slide-n-Lock mounting: no visible screws and simple removal for adjustment Compact, clear format: 4 7/8" (125 mm) dial, 6" (152 mm) base, 1 5/8" (41 mm) depth; weight 1.3 lbs (589 g) Lifetime assurance: warranty on finish and movement; United States Patent #7,293,456