Isabellenhütte Heusler GmbH & Co. KG is a leader in the field of shunt-based current measurement technology. Its precision measurement systems are marketed under the ISAscale® brand. Isabellenhütte Heusler GmbH & Co. KG has been owned by the Heusler family since 1827. The company employs some 950 people at its headquarters and production location in Dillenburg (Hesse, Germany)