Vanguard Instruments Company, Inc. (hereinafter shorted as Vanguard) was founded in 1991, and located in Ontario city, California state, USA. Over 30 years, Vanguard has been all along focus on design, development and production of test instruments for global power industry. Vanguard offers a wide range of diagnostic test instrument that accurately and efficiently measures the health of critical power equipment, such as transformers, circuit breakers, protective relays and so on.
