It’s great fun and a complete journey of discovery to repair and recalibrate vintage electronics with the instruments, ‘standards’ and ‘fixtures’ recommend and supplied by the manufacturer. This episode of Retronics presents a few such instruments, specifically from Tektronix. Although the company offered a calibration and service for their oscilloscopes, they actually provided the information and equipment to do it yourself. That equipment, once expensive, now rare but not forgotten, does it still work after 40 to 60 years?