Doble Engineering Company is the world leader in diagnostic test instruments and knowledge services to the electric power industry. Our decades of unsurpassed cumulative knowledge and field testing experience have enabled us to develop diagnostic test instruments that accurately assess electrical apparatus condition. Engineered to perform consistently despite rough handling in transport and under adverse conditions, Doble instruments are legendary for reliability in the field.

Now in 110 countries, Doble Engineering has been helping clients in the electric power industry improve operations and optimize system performance for more than 85 years.

Doble offers diagnostic instruments, services, and the world’s premier library of statistically significant apparatus test results for the benefit of energy generation and delivery companies and industrial power users worldwide.

Doble was acquired by ESCO Technologies Inc. (NYSE: ESE) in 2007. Doble continues to be operated as a stand-alone company.