A magnet
A magnet is an object that attracts metal due to its magnetic field. When a metal object comes in close proximity to a magnet, it is pulled towards the magnet due to the attractive force between the magnetic poles.
Diode detector
FM detector And Evelope detector
it is a detector that does not change the conditions in which it is being used
A lie detector cannot be used in court. On rare occasions it can be used as an investigation tool. Check with an attorney.
Polymorph is used as a lie detector.
small magnet used to give direction
hydrogen detector
no it was not
No gold is non magnetic, but electromagnetism using a metal detector can. New designs differentiate ferrous metals like iron from nonmagnetic metals like gold, brass and copper.This known as ferro magnetism and dia magnetism. The detector has a meter or headphone signal to tell one from another.
Vg-2 is a radar detector detector used by police in areas that its illegal to posses a radar detector. However, its barely used as most police departments now use to spectre1-5.
A lifting magnet is an electromagnet that is meant to hold or move material that comes in contact with the magnet. This is the opposite of a traction magnet.