Subtronics [india] offers a strong and sensitive metal detector, which works on normal 9v dc batteries. This compact device is able to detect a `one rupee coin` from a distance of 7 cm. Sensitivity and range increases for larger objects. Sensitivity is adjustable and the instrument gives a unique beep tone to indicate the existence of ferrous and nonferrous objects. The current consumption is less than 3 ma, which enables the detector to work continuously for more than a month depending on the usage. Its lightweight of approximately 250 gm and belt makes it easy to carry.
