Hotplate stirrers, also magnetic stirring hotplates or just magnetic stirrers, are devices used to heat and stir liquids. They work by magnetic forces between a rotating magnet in the base of the hotplate and a magnetic stirring bar in the liquid. Hotplate stirrers are used in many different settings, including chemical labs, food production, and medicine. They can be used to heat and stir large volumes of liquid at once, making them ideal for use in industrial settings. They come in a range of sizes and features with some being just a stirrer, some are just heaters, and some are both.