SB-500 altimeter and barometer

features:

The clear and easy to read dial can be calibrated to known elevations by simply turning the outside dial
Barometric pressure between 21 inches and 31 inches of mercury, is measured on the inner ring
The instrument is protected in a soft vinyl case with a clear window
Comes with a strap

Protected by shock-resistant case, the model SB-500 measures altitude to 4000 meters in 100 foot increments. The clear and easy to read dial can be calibrated to known elevations by simply turning the outside dial. Barometric pressure between 21 inches and 31 inches of mercury is measured in the inner ring. The altimeter is protected in a vinyl case with a clear window.