Subtronics India Pvt. Ltd. Offers Metal Detector Coils. Metal Detector Coils are available in two models M1 and M2. Subtronics India Pvt. Ltd. Is an ISO 9001:2000 certified company. The scan area of Metal Detector Coils model M1 has a scan area 30 inches x 10 inches, while the dimension is 40 inches x 10.5 inches x 2 inches. The Metal Detector Coils with the model number M2 has 14 cms diameter.