Voltmeters; ammeters; wattmeters; insulation resistance meters; resistance measuring instruments; ohmmeters; electric meters; total flow meters; flow rate meters; watt hour meters; revolution counters being tachometers; total distance meters being distance measuring apparatus; velocity meters; withstand voltage testers; frequency meters; voltage testers; thermometers not for medical purposes; hygrometers; tachometers; barometers; anemometers; pressure gauges; temperature and humidity meters w...