Send us a message. TEKTRONIX PIO-24 CIRCUIT BOARD. Designated trademarks, brand names and brands appearing herein are the property of their respective owners. Please do not hesitate to reach out if you have additional questions regarding an item before purchasing. SIGMA Surplus is a division of SIGMA Group. We stock a wide variety of items ranging from small parts to complete machines. Product images shown on the items are representative photos. We appreciate your business!