Temperature compensated, aneroid movement. Fully adjustable. Inch and millibar scales. Our standard barometer movements are calibrated for altitudes to 3,500" above sea level. * Maintenance-free, ultra-hard finish guaranteed to NEVER tarnish * Patented Slide-n-Lock™ Mounting System, no visible mounting screws, easy removal for adjustments & battery replacement * Weatherproof construction for outdoor use * Beveled glass crystal * United States Patent #7,293,456 * Lifetime warranty on finish and movement * Dimensions: Dial: 4 7/8” (125 mm) Base: 6” (152 mm) Depth: 1 5/8” (41 mm) * Weight: 1.3 lbs (589 g) * The perfect outdoor barometer * Temperature-compensated, aneroid movements * Calibrated for up to 3500 feet above sea level * Tarnish-proof, water-proof, maintenance-free design * Features Slide-n-Lock mounting system * 125mm dial diameter