HD-40 | 8 KiloHertz DuraSonde Transmitter


The HD-40 has been redesigned to be more durable and powerful. 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. You MUST have a multi-frequency receiver with an 8K setting, like Prototek’s LineFinder 2200.

  • 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
  • Our Spring Carriers are recommended to help protect your transmitter
  • Prototek Battery Caps available for use with pushrods (sold separately)

All transmitters ship 2-day for the price of ground. Just select ground at check out.

SKU: 00-221-HD40 Categories: , ,

Q: Do you have a product that will help protect my DuraSonde transmitter in the pipe?
A: Yes. You can check out one of our Spring Carriers.

Q: Will this transmitter locate in cast iron or steel?
A: No. The 8 KiloHertz frequency is only used for locating in nonmetallic lines. Best used when working near power lines. Check out our FD-series for cast iron and our LD-series for ductile steel.

Q: I am using a receiver other than Prototek and I am not getting the range that you advertise on your website. What is the deal?
A: Our receivers are very sensitive, they tend to pick up the signals a little better than others. All our ranges posted on our website are determined with our receivers. We can’t guarantee what you will get with other brands of receivers.

Q: How can I attach my transmitter to my push rod?
A: For rough terrain we recommend using one of our Spring Carriers. For lighter use you can try our Dropcap.

Q: Why am I not getting full range anymore?
A: As with most electronics the stronger your battery life the more performance you will get out it. So we recommend using fresh batteries for every locate.


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