N-899A ADJUSTABLE POCKET TONE GENERATOR
The N-899A features user five adjustable tones set to: 50, 100, 200, 400 and 800 Hz. The frequencies are changed in the rotating knob at the top. This N-899A runs on a single 9-volt battery and has both RCA and alligator clipped outputs.
( N-899A, N899A, N 899 A, N 899A, N899 A )