Most of us have used a graduated cylinder at some point in our lives, usually in high school chemistry. The cylinder with all the hatch marks in it and a plastic bottom? That was the graduated cylinder, which is probably one of the simplest and most useful pieces of equipment you’re likely to find in a lab.The Erlenmeyer flask is probably the quintessential piece of lab equipment. If there’s a movie or television show involving science, then it’s a near certainty that someone, at some point is going to be holding one up and gazing at the contents.