In a fluid leak detector, a sensor film is utilized, which includes a central support film having on its top surface a first patterned, conductive electrode film and on its bottom surface a second patterned, conductive electrode film. The resilient valve body includes a tapered set port that stretches when a plug is pushed by a medical implement which in turn pushes the set port. In one implementation, a Wilkinson-style device with switches to select different path lengths and therefore operating frequencies. The pointer coordinate system is changed from the detected viewpoint information in accordance with a specific instruction of the operator.