Crystal controlled frequency in both transmitter and receiver increases tracing distance 50-100 percent over earlier tow-box detectors.

Unlike other units that use a separate transmitter and receiver, the TW-6, when mounted on the handle, can conduct "blind" searches of an area to locate an underground pipe or cable when the starting point is unknown.

VCO (Voltage Controlled Oscillator) gives a wider range of audio signal to indicate the presence of metal. Even after the meter pegs, the audio signal goes much higher in pitch and volume. Noise Cancelling circuitry eliminates power line interference.

Powered by 16 standard AA (penlight) batteries: eight in the transmitter and eight in the receiver. Weighs only 5-1/2 pounds.

The model TW-6 "Two Box" metal detector finds underground pipes, cables, manhole covers, vaults, valve boxes and other metallic objects. Like earlier models, the TW-6 is used primary by water departments, telephone companies, power companies, and petroleum pipeline companies when making repairs and rearranging lines. The TW-6 shows where to dig, as well as where NOT to dig, and important consideration when working near gas lines.

To increase the instrument's sensitivity, Fisher engineers removed all unnecessary metallic parts on the TW-6, replacing them with durable ABS molded plastic. Newly designed coil windings, completely upgrade electronics and nonmetallic parts have boosted the tracing distance of the TW-6 by 50-100 percent.

With the TW-6 longer tracing distances, which used to require expensive high-powered fault locator/tracers, can now be accomplished economically.