Doble Engineering | 56,056 followers on LinkedIn. Together We Power the World™ | Doble is the world’s most trusted brand in electrical diagnostics. We provide energy system engineers with the tools, insights and confidence to anticipate and overcome tomorrow’s power demands today. Doble has been helping clients in the electric power industry improve operations and optimize system performance for over a century with solutions for transformers, bushings, circuit breakers, rotating machines, protective relays, and cables.