This device inspects or measures the magnetic field. It is produced with the semiconductor technology and is designed to have the uncomplicated structure of transistor. A Magneto-transistor consists of three legs which are Emitter (E), Base (B) and Collector (C); thus it can be produced in a lot at a time. Moreover, a Magneto-transistor can also be used for various purposes, i.e., to measure the density of a magnetic field, to be used as a magnetic pole detector, to measure the velocity of a motor, to check and count the number of cars on a street, and to be used as a switch. Compared with general switches, a Magneto-transistor is better because it does not get into contact with metal surface like normal switches do, so it does not cause harms and it also saves maintenance cost. It also can be used in all kinds of circumstances such as in a dusty place, in a place with a high level of humidity, or even in the place with a great deal of steam or in the water.

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http://tmec.nectec.or.th