The ARC 303 is a practical electrosurgical device that provides high-quality cutting and coagulation, e.g. in general surgery, cardiac surgery, thoracic surgery, urology, gynecology and orthopedics. Two monopolar and one bipolar instrument can be connected to it. The device ensures the performance of all basic electrosurgical functions. ARC PLUS is an add-on unit to ARC 303 and ARC 250 for use in argon plasma electrosurgery. Argon with a frequency of at least 4.8 creates an electric bridge between the electrode and the tissues for precise, non-contact coagulation. A standard instrument for flexible endoscopy or liver surgery. Operation is carried out from the front panel of the ARC PLUS.