Electrosurgical units (ESUs) are a crucial piece of equipment in operation rooms, used in 85% of all surgeries. These units use high frequency currents to generate heat and manipulate human tissue. Electrosurgery testing ensures patient safety, due to the high risks that are associated with high frequency electrical current and the human body. Periodic testing is an IEC 60601-2-2 requirement and manufacturers typically recommend 6-12 month test intervals. The procedure typically involves electrical safety tests, visual inspections and performance tests. The performance procedure usually consists of output power measurement tests, high frequency measurement tests and return electrode monitoring tests.