1930s: use blood samples to test for certain diseases

1960s: allows people with diabetes to monitor their blood sugars

1890s: help see inside human body, helped diagnose broken bones and more

1970: use magnets + radio waves to create image of internal body, used to diagnose tissue injuries

1970: more advanced than x-rays, diagnose tumours

1940s: build up a picture of the inside of the body, good for stones/kidney stones

1900s: long flexible tube with a camera used to inspect digestive system and other things in body