Vanguard Instruments Co

Vanguard Instruments Co. is a leading provider of diagnostic test equipment for substation assets, specializing in transformer and circuit breaker health monitoring, and serving the North American power grid. As a Doble company, we deliver rugged, reliable, and accurate testing solutions – including turns ratio testers, current transformer testers, and winding resistance meters – designed to ensure the longevity and performance of critical electrical infrastructure. We support utilities, OEMs, and contractors with comprehensive testing services, from field testing and forensic analysis to laboratory diagnostics and cybersecurity solutions. With a strong commitment to quality and customer satisfaction, Vanguard Instruments Co. empowers our clients to optimize asset performance and minimize downtime, backed by a robust support network and a dedication to innovation.