Fostex TT-15

Test tone generator
 
The TT-15 is a handy test tone generator generates 5 selectable frequencies at 3 different output levels.
Extended information:
Handy test tone generator generates 5 selectable frequencies at 3 different output levels. Can operate for up to 30 hours (continuous) with battery type S-006P, 6F22 or equivalent
Technical specifications:
Selectable frequencies: 40Hz, 400Hz, 1kHz, 10kHz, 15kHz Switchable output level: 0dBV (1kHz), -10dBV, -30dBV
Flexibility is further enhanced with all ten outputs being available both on the front and rear panels.