Solid brass with lacquered finish for use onshore. Powered by the Hi-Sensitivity barometer movement. Unique polycarbonate movable multi-purpose markers. Dial diameter: 3.825. Weight: 4.5 lbs. S Design Patent # USD459,256 S. Calibrated for up to 3000 feet above sea level. If you are at a higher altitude it will not function. The item “TRINTEC [...]