[ Scientific equipment in the nature of test and measuring equipment, namely, flatness testers, surface roughness measuring instruments, galvanometers, air wire testers, oscillators, oscillographs, capacity measuring instruments, phase meters, integrated watt meters, electric leakage indicators, watt meters, ammeters, voltmeters, vacuum tube testers, magnetic measuring instruments, resistance measuring instruments; circuit meters, optical instruments and equipment, namely, electronic and opti...