Medical three sources are strong measuring instruments. One from the nature of the medical three sources themselves: "Measurement Law Enforcement Rules" on the definition of measuring instruments have a clear description, measuring instruments are used to directly or indirectly measure the measured object value of the device, instrumentation, gauges and standard substances used to unify the value. Medical X-ray machines, ultrasound machines, laser therapy machines, etc., respectively, through these devices contained in the medical radiation source, ultrasound source, laser source through the human body physiology and pathology to determine the measurement of its output energy, and through the control device to control the amount of value in order to achieve the purpose of diagnosis and treatment. According to the definition of measuring instruments, medical diagnostic and therapeutic equipment contained in the medical three sources should be measuring instruments.
The second is from a legal point of view: "the Chinese people *** and the State Measuring Instrument Certification Management Measures" (issued by the State Council, administrative regulations are more effective than departmental regulations) will be included in the medical three sources of the "strong test measuring instruments catalog".