* Size: 3.260"W x 3.260"H x 8.28"L
    * Operation: -1000 ft. to 50000 ft.
    * Presentation: Pointer and counter
    * Internal Lighting: 28 VDC, 100 mA typical; or 5 VDC, 500 mA typical
    * TSO: C10b, C88, ARINC 408
    * Dial: 20 feet increments
    * Power Supply: 22 to 29 VDC; 220 mA typical
    * Altitude Output: 0.2 VDC/1000 ft.