A donut load cell is a type of force sensor that is used to measure weight or force. It consists of a metal ring with a hole in the center, and a load cell sensor that is placed in the center of the ring. The sensor measures the force exerted on the ring by the weight of the object being weighed, and this information is used to calculate the weight of the object. For more information visit novatechloadcells.co.uk/products/f205.