Final answer:
A plasma sterilizer is approved for salon use as it effectively sterilizes equipment by penetrating surfaces and killing vegetative cells and endospores.
Step-by-step explanation:
A sterilizer that is approved for salon use is a plasma sterilizer. Plasma, which is a hot, ionized gas and described as the fourth state of matter, is useful for sterilizing equipment because it penetrates surfaces and kills vegetative cells and endospores. The use of plasma allows for effective sterilization in salon settings.