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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 balancing hoists