TESCO, also known as The Eastern Specialty Company, is a manufacturer of meter testing instruments and accessories. It provides phase sequence indicators, computed tomography field test sets, meter test switches, transformer polarity checkers, and artificial loads and burdens. The company also offers meter warm-up boards and cleaning systems, service ground test sets, industrial flashlights and related accessories. TESCO provides meter shop layout, statistical sampling, equipment specification and field services. It also offers facility relocation, quality system and project management and customized equipment services. The company serves the electric distribution and metering industries. Founded in 1904, TESCO maintains a team of meter test technicians and engineers. The company is located in Bristol, Pa.