Incorporated in 1970, Extech Instruments Corporation (Extech) is based in Waltham, Massachusetts USA, just West of historical Boston on the Rt. 128 Technology Highway. Extech Instruments is a privately held corporation whose high-value, handheld test instruments are sold through a network of national catalog houses, regional stocking distributors and international master distributors. The company has become one of the largest manufacturers and suppliers... more info »