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I would like to inquire about passive tag that can be used as a sensor The sensor should be very small in size (up to 4x4 cm) of the sensor will be able to check whether a metal foreign body enters into it.The box size 5x5 cm not conduct electricity, hard plastic insulatorIt should be noted that the insertion of a foreign body is manual,Foreign body is made of thin metal,Proximity of two meters from the sensor is active tag that transmits the data received from the sensor.Is it possible to find such a sensor or make one?If there is, how much money does it cost? Thank youRoei *******@*****.com