TESCO (The Eastern Specialty Company) is a long-standing manufacturer in the utility metering industry, known for producing reliable and rugged meter testing instruments and accessories since 1904. Originally founded by a metering engineer from Philadelphia Electric Company, TESCO developed the first meter test switch to improve safety and efficiency in the field. Today, the company offers a wide range of products including test switches, artificial loads, burdens, wattmeter accessories, and ultrasonic cleaning systems. TESCO also provides technical support and consulting services for utilities, helping with regulatory compliance, meter shop layout, and quality systems. Headquartered in Bristol, Pennsylvania, TESCO serves utility companies globally with a strong reputation for quality, innovation, and customer service.