6685-00-540-9016 (MILI25091TYPEMA2)
6685-00-540-9016 is equivalent to manufacture part number 1521BX4-06. It is a pressurized compartmen altimeter and is classified under Federal Supply Class 6685 (6685 - Pressure, Temperature, and Humidity Instruments), stocked for defense, aerospace, MRO, and industrial maintenance applications. This item is cataloged in the NATO supply system under 6685 - Pressure, Temperature, and Humidity Instruments and is available through NSN-PARTS for U.S. government MRO, and commercial procurement.