Hi, I want to use a digital ammeter to measure the current flow though a Raspberry pi. The Pi uses about 700mA and is 5V so its got a resiatance of about 7 ohms. Therefore something like 0.5 ohm ammeter will have a large voltage drop of about 0.3V which is way too large and would lead to the Raspberry pi crashing. The issue is that I have no clue what the resistance of an actual ammeter is and googling it doesn't turn anything up. I understand that the resistance will vary from ammeter to ammeter but is there some sort of general figure which I could use? I could just try it and see but I'd rather have a number to work with. Also, these are ammeters at school and so I dont have access to them at the moment, and there's no indication on them and no technicians know either. Also, I have access to a multimeter too, will this have a lower resistance or be more accurate so preferable for use? Thanks!