Final answer:
The final step in disinfection of non-electric instruments requires immersion in a disinfectant solution to kill or inactivate microbes and prevent the spread of infections.
Step-by-step explanation:
The final step in the disinfection of non-electric instruments requires immersion in a disinfectant solution. Disinfectant solutions contain chemicals that can kill or inactivate microbes on the surface of the instruments. This helps prevent the spread of infections.