salamat po..pero non contact po xa.... capacitive proximity sensor is non-contact sensing solution to metallic as well as non-metallic objects. With adjustable sensitivity almost any medium can be detected with desired reliability.
kindly check this out po...
capacitive sensor is cylindrical po xa... parang barrel...threaded...
may nahanap po ako pero ang mahal mahal...whoaaah! 5000+ each...
meron po ba kaung alam na mas mura...