YG520B portable pressure tester can detect the technical indexes of insulation strength of the tested instruments or materials, and is widely used for the insulation testing of electrical appliances, transformers, power lines, electric meters, motors, power plugs, and cables. It is suitable for the insulation testing of household appliances such as TV sets, electric fans, recorders, refrigerators, washing machines, microwave ovens, and hair dryers, and electronic instruments and meters, and provides testing means for the implementation of national safety standards. Therefore, it plays an important role and becomes an indispensable instrument for scientific research institutions, testing departments, and electronic industries for testing electronic instruments and household appliances. The series instruments have beautiful appearance, convenient operation, and digital panel display output voltage, which are clear, intuitive, and accurate. The whole machine has advanced technology, reasonable layout, high accuracy, good reliability, and convenient maintenance.