Mid-Range Sondes for Versatile Underground Locating
Handle everyday locating jobs with confidence using mid-range sondes built for versatility, signal control, and consistent performance. Designed for standard pipe diameters and moderate depths, these sondes deliver reliable signal transmission for sewer lines, ducts, and nonmetallic utilities across a wide range of jobsite conditions.
FD-20 | 512 Hertz DuraSonde Transmitter
The FD-20 is the most popular transmitter in our 512 Hz line for locating in cast iron and nonmetallic lines. And now with its new more durable design the FD-20 is ready to transmit even in the toughest terrain.
Replaces our FV-20 transmitter
- Steel head for durability
- Encased in a strong polycarbonate tube.
- Watertight
- Brass battery cap and 1 AAA alkaline battery included
- Will work with any receiver that uses the 512 Hz frequency. For best results use one of our LineFinders
- Our Spring Carriers are recommended to help protect your transmitter
HD-40 | 8 KiloHertz DuraSonde Transmitter
The HD-40 has been redesigned to be more durable. This 8 KiloHertz frequency DuraSonde transmitter is used to transmit in nonmetallic lines only. If you are locating around power lines this powerful highly efficient frequency will greatly reduce interference.
Replaces our HV-40 transmitter
- Stainless steel head for durability
- Encased in a strong polycarbonate tube
- Non-metallic locating only
- Water tight
- Brass battery cap and 1 AAA alkaline battery included
- For easy use with a push rod or sewer machine check out our Spring Carriers or Dropcap
- Our Spring Carriers are recommended to help protect your transmitter
LD-9 | 16 Hertz DuraSonde Transmitter
The LD-9 is our smaller of the 16 Hz line of durasonde transmitters. LD-9 has a new more durable design and stronger signal. If you are going to locate in ductile iron or steel pipes this transmitter will do the job. This transmitter will also work great in cast iron where there is a lot of electrical interference.
Replaces our SB-9
- Best used when locating in Steel or Ductile Iron
- Stainless Steel head for durability
- Encased in a strong polycarbonate tube
- Water tight
- Brass battery cap and 3 AAA alkaline batteries included