Digital multimeters; multimeters; electric meters; voltage meters; ammeters; ohmmeters; calibrators, namely, thermometer calibrators, dry block calibrators, fluid flow calibrators, pressure calibrators, electrical calibrators, process calibrators, and loop calibrators; loop calibration multimeters; digital insulation multimeters; laser distance meters; broadband loop testers; broadband loop analyzers; electrical testers; electrical analyzers; phase rotation meters; power quality analyzers; power quality meters; voltage recorders; power quality recorders; power event recorders