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Electrical Comparator operates on the Principal of the Change of Inductance of a coil by movement of a steel armature, which is moved by a plunger arrangement in contact with the surface to be checked. Two of the bridges form a bridge. Initially the inductors are set so that no resultant current flows through them. When armature is moved, the balance of bridge is disturbed and a result the current flows which is calibrated in terms of length of movement of the plunger consists of Electrical Gauge Head with armature and feeler, Ammeter, Power supply, with 2 amps x 2 Nos. dimmer & Specimen Holder.