Fisher F-75 Metal Detectors
The Fisher F75 is a multi-purpose high-performance computerized metal detector. It has the high sensitivity and ground balancing control needed for professional gold prospecting, the discrimination responsiveness needed for serious relic hunting under difficult conditions, and visual target ID considered essential in searching for coins. The Fisher F75 operates at 13 kHz for good sensitivity to gold nuggets and jewelry as well as to coins. The Fisher F75 comes with an 11-inch elliptical Bi-Axial search coil for maximum detection depth in mineralized soils.
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Tim Pearson, a metal detectorist and amateur treasure hunter (aren't we all?) found what he thought was a milk bottle cap back in 2005. Pearson was detecting in a South Yorkshire field that he had combed over for more than six years. In the past the field that had yielded nothing more than a Roman coin for him, but this time, there was something special waiting. 
What Pearson found is a relic now known as the "Yorkshire Aestel" and is the only one of its kind held by a private owner. It's a hallow "cast pointer" that would have been used by monks as an aid to reading manuscripts. Auctioneers claim -that King Alfred (who ruled from 871 - 899) commissioned several of these aestels to made for his bishops to aid the translation of Pope Gregory I's Regula Pastoralis.