Keysight Rack Mount Kit This Keysight rack mount kit is designed to mount a Keysight instrument on either the left or the right side of a rack. It is compatible with the Keysight 34410A, 34411A, 34401A and 34420A DMMs, the 34970A Data Acquisition Switch Unit, the 53131A, 53132A and 53181A frequency counters, the 33220A, 33120A and 33250A function generators and most other 2-slot, half rack sized Keysight instruments.