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SERVICE INSTRUMENTS USED IN THE HEATING AND AIR CONDITIONING FIELD, FOR MEASURING, TESTING, DETECTING GASES AND MONITORING SAME-NAMELY, COMBUSTIBLE GAS DETECTORS, CAPACITOR TESTERS, HALOGEN LEAK DETECTORS, HALOGEN MONIIORING SYSTEMS, INSULATION TESTERS, MULTIMETERS, DC CLAMP-ON-VOLT-OHM-AMMETERS, DIGITAL CLAMP-ON-VOLT-OHM AMMETERS, DIGITAL ELECTRONIC THERMOMETERS, AC VOLTAGE DETECTORS, CONTINUITY/CAPACITOR CHECKERS, AC HIGH VOLTAGE DETECTORS, AND AIR BALANCERS