More about Tesoro Electronics, Inc.
Tesoro was founded in 1980 by Jack and Myrna Gifford in Phoenix, Arizona. Jack is an electrical engineer and got his love of treasure hunting from his grandfather, Morgan Gifford, who had staked his own gold mining claim at the turn of the 19th century. When Jack and Myrna had two sons, Vince and James, the boys inherited the family love of treasure hunting and know-how about electrical engineering. Since 2004, Vince has been running Tesoro as president and owner. Under Vince's leadership, Tesoro remains a family business that continues to utilize tried and true technology that has always worked. The company takes pride in designing and manufacturing metal detectors that are light weight, reliable, and effective. Life time warranty. Made in the USA.
Is a crystal-controlled metal detector better than one that is not crystal-controlled?
Most metal detector manufacturers use crystal resonators in their machines because of the tight tolerances of the resonator. If the part is listed as 15.7 kHz, all parts will be exactly that frequency. The downside of these super tight tolerances is that the detectors are more likely to crosstalk with each other. In other words, the transmit and receive signals from two or more different machines will start interfering with each other.
Tesoro metal detectors use an LC or tank circuit to generate operating frequency. A capacitor and an inductor are paired together and create a naturally occurring efficient frequency. Variation in the capacitor and inductor cause slight variations in the operating frequency, which reduces the likelihood of crosstalk with other Tesoro metal detectors. The variation is small enough that it does not affect the performance of the detector.