Systron Donner Inertial was a high-quality provider of alternative technologies, multimeters, frequency counters, and other types of test equipment. With more than 50 years of industry experience, consumers trusted Systron for comprehensive and affordable testing solutions. Systron products have no friction because they have no moving parts. This makes Systron equipment last longer than other products with virtually no known modes of wear out. Systron products do not require regular recalibrating or rebuilding. These perks made Systron one of the most popular brands for test equipment and supplies. In 2015, InnoVista Sensors acquired Systron Donner Inertial Inc. However, consumers can still find used and refurbished Systron items at ValueTronics.com.