The VM-540 Compact Sonde Locator by Vivax-Metrotech offers 60Hz (passive), 512Hz, 8kHz & 33kHz for sonde locating with push-button depth. The sonde frequencies are ideal for most plastic drain pipe and pipe inspection camera applications. The lower frequency works well for the metallic pipe. 

Application: Sonde & Pipe Inspection Camera head locating.
Frequencies: 60Hz (passive), 512Hz, 8kHz & 83kHz (using sondes)