ALT ENCODER PRESSURE ALTITUDE/Rectangle, 62K. Pressure Altitude: -1,000 to 62,700 ft 650-1ALT ENCODER PRESSURE ALTITUDE/Rectangle, 62K. Pressure Altitude: -1,000 to 62,700 ftThe model 650 is a digital readout for the blind encoding altimeter, whichreads altitudes from minus 1,000 to plus 3..