Which medical measuring instruments are mandatory? thank you

The measuring instruments for compulsory medical verification refer to the working measuring instruments listed in the Catalogue of Working Measuring Instruments for Compulsory Verification in People's Republic of China (PRC) (hereinafter referred to as the Catalogue of Compulsory Verification), including medical X-ray machines, B-ultrasound machines, CT machines and laser therapy machines. Respectively passing through a radiation source, an ultrasonic source and a laser source contained in these devices.