scientific and electrical apparatus and instruments, namely, electrical and electronic apparatus and instruments, measuring or responding to changes in - temperature, flow, pressure, voltage, current or mass; regulation and control apparatus and instruments, namely, electrical and electronic industrial controls for changes in - temperature, flow, pressure, voltage, current or mass; optical, weighing, measuring, signalling, checking and teaching apparatus and instruments, namely, electrical and electronic instruments related to - temperature, flow, pressure, voltage, current or mass; electrical wires; electrical wiring; pairs of electrical wires of dissimilar metals; micro electronic instruments and components, namely, temperature and pressure responsive instruments; temperature measurement and control products, namely, transmitters, sensors, meters, recorders and controllers; thermocouples; thermistors