It really makes me worry that you are an instructor and advise people that they are going to get "made fun of" for trying to have decent equipment in preparation to a job. Maybe a seasoned medic can get a blood pressure with a fisher price scope but for someone who is not that experienced it may be a little harder. Most services carry absolute garbage scopes. New basics do not have the focus on exactly what you are doing and not what others are doing mentality. On top of that its pretty nasty putting something in your ears when you really have no idea the last person to use it. Who is it "too bad" for? The kid who makes up a pressure because he couldn't hear it and doesn't want to come off as stupid on his first day or the patient with the unstable blood pressure? You may want to come off as a hard ass seasoned medic but I think it may be time to hand off the teaching belt and move on to another field. Medical nonsense aside your attitude is just shitty.