The answer is fire extinguishers. Milady's shop-safety section is direct and unqualified: "All employees should be instructed in fire extinguisher use." This sits alongside other shop electrical/chemical safety rules — like never touching metal on a live appliance and disconnecting appliances by the plug, not the cord — that fall under general shop-safety training rather than pure microbiology.
Hydraulic chairs, implements, and disinfectants — the other choices — all require some familiarity to use safely, but fire extinguisher training is the one Milady singles out as something every employee, not just the barber performing a service, needs to know.
Milady Standard Barbering, 6th ed., Ch. 4 (Infection Control), p. 84: "All employees should be instructed in fire extinguisher use."
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