TEST TOOLS, NAMELY, INSULATION RESISTANCE AND CONTINUITY TESTERS AND VOLTAGE AND CURRENT TESTERS, MULTIMETERS, FIBER-OPTIC WALKIE-TALKIES, FIBER-OPTIC POWER METERS, FIBER-OPTIC POWER-AND-LIGHT-SUPPLIES, COUPLERS AND ADAPTERS ALL USED IN INSTALLATION, MAINTENANCE AN LABORATORY APPLICATIONS FOR TELE-DATA, AND VIDEO-COMMUNICATION LINES AND SYSTEMS; TEST EQUIPMENT, INSTRUMENTS AND DEVICES, NAMELY, PASSIVE COUPLERS, BARE FIBRE ADAPTERS, PROBE OSCILLOSCOPES, DIGITAL INSULATION METERS, MEGAOHMETERS, OHMETERS, DC VOLTIMETERS, AC VOLTMETERS, DC AMMETERS, ALL USED FOR INSTALLATION, MAINTENANCE AND LABORATORY APPLICATIONS BY FIBER OPTIC, TELEPHONE, ELECTRIC, DATA AND CONSTRUCTION PROFESSIONALS, ENABLING THE USER TO MEASURE, DETECT, TEST AND TRACE POWER LINES, ELECTRICAL CONNECTIONS, CABLE PAIRS AND METALS; VIDEO CONFERENCING SYSTEMS AND EQUIPMENT COMPRISED OF WATER-AND EXPLOSION-PROOF INDUSTRIAL TELEPHONES FOR OUTDOOR AND INDOOR ENVIRONMENTS; HEADSETS, AMPLIFIERS, SPEAKER PHONES, TELEPHONES, BATTERY POWERED FIELD TELEPHONES, MOBILE TELEPHONES, HEADSETS WITH ACTIVE BACKGROUND NOISE CANCELING, AVIATION HEADSETS, HEADSETS FOR MULTIMEDIA APPLICATIONS, NETWORK INTERFACES, AUDIO BOARDS, VIDEO BOARDS, SWITCHING BOARDS AND MULTIPLEXERS, AND ELECTRONIC MULTIPOINT CONTROLLERS, FOR DIGITAL TRANSMISSION OVER TELEPHONE LINES
Electrical and Scientific Apparatus