Doble Engineering Company has been assisting clients in the electric power industry to improve operations and optimize system performances for more than 85 years. It provides diagnostic instruments and maintains a library of statistically significant apparatus tests. The company serves the energy generation and delivery industries and industrial power users worldwide. It produces various products for partial discharge detection, surge arrester monitoring, and protection and transformer diagnosis services. Doble Engineering Company s products also provide assistance with circuit breaker and online diagnostics, as well as insulation, material and sweep frequency response analysis. It additionally offers maintenance and performance testing services for high-voltage power equipment, as well as engineering consultations. The company has achieved ISO 9001:2000 certification.