Metal Detector with 3.5 Meters Depth has good ability of wide detecting scope, accurate orientation, good discrimination ability, easy operation and so on. It also has the function of distinguishing ferrous and non-ferrous metal. Come and get one from detectorall.
In 1881, Alexander Graham Bell invented the first metal detector. As President James Garfield lay dying of an assassin's bullet, Alexander Graham Bell hurriedly invented a crude metal detector in an unsuccessful attempt to locate the fatal slug. Bell's metal detector was an electromagnetic device he called the induction balance. This is the first metal detector device appeared during the human being history, also with the fast development of modern science and technology, different kinds of metal detector products appear on the market and bring people lots of benefits, the history and the use of metal detector you can get to know more about such device from detectorall.
In 1925, Gerhard Fischar invented a portable metal detector. Fischar's model was first sold commercially in 1931 and Gerhard Fischar was behind the first large-scale production of metal detectors. According to the experts at A&S Company, it says that "In the late 1920's, Dr. Gerhard Fisher, the founder of Fisher Research Laboratory was commissioned as a research engineer with the Federal Telegraph Co. and Western Air Express to develop airborne direction finding equipment. He was awarded some of the first patents issued in the field of airborne direction finding by means of radio. In the course of his work, he encountered some strange errors and once he solved these problems, he had the foresight to apply the solution to a completely unrelated field, that of metal and mineral detection.
Now let us turn the direction to the modern design of such modern device, look at this list, this metal detector from detectorall, you will know more. The Underground Gold Treasure Metal Detector with 3.5 Meters Depth has good ability of wide detecting scope, accurate orientation, good discrimination ability, easy operation and so on. It also has the function of distinguishing ferrous and non-ferrous metal. It is mainly used for detecting and identifying underground metals and it can be used for security inspection, public security organs ransack, scanning metal foreign matter in raw, fuel and foods, scanning metal articles in mail or luggage, detecting underground pipelines, cables and so on. More detailed information is at detectorall. Come and add one to your chart!
Here is about its specifications: Power supply: DC12V (8pcs 1.5V Batteries in Series) Shooting frequency: 6.99KHz Signal frequency: 437KHz Visual: Lever Meter Indicator: Sound: 2 Speaker or earphone(earphone not included) Disc: Ground Balance Controls Disc Control: Ground Balance control Tune control: Sensitivity control Discrimination Control Zeroing control The Detecting Depth (Max): 3.5 Meters Working electric current: 300MA at Max Volume Sensitivity: 35cm for a US(25cent) Quarter with meter Indication at min, discrimination Accessories: Battery box and battery bag Gross weight: 3.2kg Color: Black .