The technological developments of modern days have resulted in the introduction and usage of certain highly useful devices whose role cannot be ignored. Metal detector is an example worth mentioning in this context. The metal detectors find can leave anyone without with at least a slightest astonishment, while looking into the precision factor. The equipment employs an electronic circuit with oscillator as the main component. The detection is done based on the change in magnet field around the subject. When the device is placed near to the subject, the oscillator produces current, which causes a magnetic field around it. This magnetic field when compared with another can show the change in value. The devices are lighter and do not demand the use of high battery power. Also there are options for the user to set its parameters like tracking speed, threshold volume, sensitivity etc. The portable nature of the equipment is another advantage.