I am looking for Gold flakes/small nuggets in a very mineralized iron ore area and quartz veins also to search in shallow streams. A Metal Detector that i can use to find everything on water and land. Unlike the beat frequency oscillator or the induction balance machines which both used a uniform alternating current at a low frequency, the pulse induction machine simply fired a high-voltage pulse of signal into the ground. With the invention of the transistor in the 1950’s and 60’s, metal detector manufactures and designers made smaller and lighter machines with improved circuitry, running on small battery packs. Another leader in detector technology was Charles Garret, who pioneered the BFO (Beat Frequency Oscillator) machine. His application for a hand held Hidden-Metal Detector was filed in February of 1924 but not patented until 1928. Although Gerard Fisher was the first person granted a patent for a metal detector, the first to apply was a man named Shirl Herr, a businessman from Crawfordsville, Indiana. The X-Terra 705 comes standard with a 10.5″ DD 7.5kHz Coil. Also Includes Minelab 10″ x 5″ Elliptical Coil — Save �70. The Gold Bug has two search modes: All metal and discriminate mode and has an operating frequency of about 19 kHz. The Gold Bug is a lightweight metal detector, and is very comfortable to swing all day, particularly when using the small 5″ round coil. XP Deus helps reduce the user’s fatigue by providing wireless audio headphones, reducing the weight on the user’s ear and giving them more comfort by not being tethered to the detector. Smartfind 2, provides the target identification, with it’s Fe-Co discrimination pattern. It uses the FBS 2 technology, which allows the detector to find more targets in various ground conditions. It has GeoHunts, which indicates the ground already covered by the user saving time for the user instead of going around in the same places. The FC (Ferrous Coin) is for coin-sized targets for grounds with low mineralization and Ground-Coin for highly mineralized grounds. That way the detector will be able to work deeper but you may end up finding a lot of trash. But, if your coil is protected by a cover, go ahead. You may also want to get a machine that’s relatively easy to use with not a lot of settings. Depending on how old the child is, you might want to start with a detector that’s not super heavy. Generally all detectors can pick up gold, but not as well as those that are specifically designed for gold. PI (Pulse Induction) detectors – adapted for gold even in stiff soil conditions. VLF (Very best metal detector for finding coins Low Frequency) detectors – adapted more for coins, relic and general metals. In civil engineering, special metal detectors (cover meters) are used to locate reinforcement bars inside walls.