Gleaming lacquer, solid brass, a compact size and German precision are the hallmarks of these fine instruments. Both of the instruments in the Trident Collection are provided with complete instructions, mounting hardware, and a fresh battery as required.Fully adjustable. Scale in inches and millibars. Barometer movements are calibrated for altitudes to 3500' above sea level. Dial: 3". Base: 4-1/4". Depth: 1-1/4".