The CR-160-BOX-R9 is an enamel painted die-cast aluminum housing intended for use with the CR-160-R9 evaluation test board. Holes have been positioned on the CR-160-BOX-R4 in locations associated with BNC connector positions (input and output) and power connector (+24V) on the CR-160-R9 board. There is also a rectangular hole to gain access to the fine gain adjustment potentiometer, the piano-style gain and polarity switches on the CR-160-R9 board.