The Handpiece Slider Sensor PCB – ACC System 20–22–24mm (Candela Gentle Pro Series) is a replacement electronic board used for spot size recognition in handpieces equipped with the Air Cooling Control (ACC) system. It assists in relaying spot size data to the system for accurate operation within Candela Gentle Pro laser platforms. This part is intended for use by trained technicians as part of standard maintenance and servicing procedures.