Parasport Aeronaut Altimeter. The mechanical altimeter made by Parasport has been redesigned, keeping the same sturdy, affordable, accurate mechanism. Calibrated up to 6.000 m (19.000 ft), with a temperature compensated aneroid capsule, the Aeronaut gives accurate readings along the full range of operation. The new case is now completely made of aluminum, and its round shape of 55 mm (2" 1/4) diameter, with a thickness of just 21 mm (3/4”), makes it very compact. Glass is shock and scratch resistant. And now the Aeronaut is also water resistant!