PulseScan TDI SL 12 was developed to provide serious detectorists a
piece of equipment that was not simply a "re-hash" of existing
technology in a new housing. Initially developed to meet the demands of
gold prospectors searching for both extremely small and extremely deep
nuggets, the TDI has evolved into a detector that has proven itself as
an effective detector for relic hunting, beach hunting and, under the
even coin hunting.
TDI is fairly simple to operate, the subtle nuances will make you successful under different conditions. White’s has an excellent instructional video on their website on how to operate the TDI. As well-known detectorist and prospector Steve Hersbach says, "The bottom line - the worse the ground mineral conditions get, the better this machine will fare compared to a VLF unit."