As a biomedical technician, you work on expensive equipment every day. When asked this question don't show defeat but show that you are confident in your skills! Talk about how it motivates you to troubleshoot and fix the item correctly. Perhaps the satisfaction that you achieve from knowing you saved millions of dollars is what keeps you going on the most stressful of days. Let the interviewer know that the price of the item doesn't detour you from performing your job.
"I give 100% of my attention to every piece of equipment that I service, regardless of the dollar value. I don't see a cost associated with the equipment. I see it as my job to fix an item to keep a patient safe."
"I can imagine that working on equipment worth millions would be intimidating, especially as I just start my career. I think that focusing on the good that will come from the repair will help me to refocus on the task at hand."
"I understand there is a new level of pressure that comes from working on multi-million dollar equipment. I focus on each small task at hand until the job is done. This method has never failed me in the five years I have worked as a biomedical technician."