Precision Integrating Sound Level Meter
Precision integrating sound level meter (CEL-175, type 1), made by Computer Engineering Ltd.
Precision integrating sound level meter (CEL-175, type 1), and microphone, made by Computer Engineering Ltd.
Precision integrating sound level meter (CEL-175, type 1), made by Computer Engineering Ltd.
Precision measurement microphone, for Precision integrating sound level meter (CEL-175, type 1), made by Computer Engineering Limited.