Properties:

A device which represents operational information on the screen of a cathode ray tube(s) for the purpose of real time monitoring of signals, as they are being recorded or reproduced on magnetic tape. It may be designed for single or multiple channel use and consists either of a single cathode ray tube for simultaneous multichannel display or multiple cathode ray tubes, mounted in-line on a single rack, for individual channel display. It may contain special features for providing output signals for external monitoring and/or recording devices.