I probably use the rotary evaporator most out of all my different bits of equipment. It separates things according to their boiling point and allows you to make chili without the heat, extract the flavour from chocolate without the colour, and make coffee that isn’t bitter. It’s pretty cool!
The thing I use almost every day is a pipette. This is a hand held piece of equipment that allows me to transfer very small amounts of a liquid from one tube to another. It has disposable plastic tips to hold the liquid, and these are ejected from the pipette once I’ve finished – after many years of practice I’m pretty good at getting them in the bin from long range!