ELECTRONIC INSTRUMENTS USED IN THE HEATING AND AIR CONDITIONING FIELD-NAMELY, COMBUSTIBLE GAS DETECTORS, CAPACITOR TESTERS, HALOGEN LEAK DETECTORS, HALOGEN MONITORING APPARATUS, INSULATION TESTERS, ALTIMETERS, 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

'ac':46,51 'air':8,56 'altimet':26 'ammet':34,42 'apparatus':23 'balanc':57 'capacitor':16 'checker':50 'clamp':29,37 'clamp-on':28,36 'combust':13 'condit':9 'continuity/capacitor':49 'dc':27 'detector':15,20,48,54 'digit':35,43 'electron':1,44 'field':11 'field-nam':10 'gas':14 'halogen':18,21 'heat':6 'high':52 'instrument':2 'insul':24 'leak':19 'monitor':22 'name':12 'ohm':33,41 'ohm-ammet':32,40 'tester':17,25 'thermomet':45 'use':3 'volt':31,39 'voltag':47,53

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