The uses detailed below represent but a few of the many applications of the Panadaptor. Inquiries are invited regarding the application of these instruments to particular requirements. Panadaptor equipments are uniquely suited for monitoring communications frequencies at airports and communication centers for possible off- frequency transmissions. The immediate appearance of such signals can be detected instantaneously and tuned to quickly with absolute minimum chances of message loss. High resolution makes the equipment invaluable for detecting and analyzing interference caused by splatter, improper location of carrier frequencies, spurious modulation, parasitics, etc. The Panadaptor is invaluable in universities and technical schools for its graphic indications of various R. F. phenomena, making them easy to under- stand and remember. The Panadaptor offers visual means of examining oscillator performance, especially in the VHF regions where small changes in circuit constants, both physical and electrical, produce large frequency variations. Oscillators can be checked against standards for determining frequency and the effects of load changes, component variations, shock, and humidity, and thermal changes upon frequency stability. Parasitic oscillations are easily spotted and identified.