Gas Detection Instruments from TPI. A full range of TPI Gas Detection instruments for all of your job needs, including Combustion Analyzers, Carbon Monoxide Analyzers and Detectors, Combustible Gas Leak Detectors and Refrigerant Leak Detectors. A771 Carbon Monoxide Adapter for DMMs & Clamp Meters 706 High Carbon Monoxide Analyzer 707 Carbon Monoxide Analyzer 719 Combustible Gas Detector 720b Combustible Gas Leak Detector 721 Combustible Gas Leak Detector 725a Pocket Combustible Gas Detector 725L Combustible Gas Leak Detector 775 Carbon Monoxide & Combustion Gas Leak Detector SP700 Carbon Monoxide Meter SP1000 Ambient Air Direct CO2 Meter 750a Refrigerant Leak Detector 753a Refrigerant Leak Detector 770 Carbon Monoxide Monitor 777 Personal CO Monitor 780 Low Level CO Monitor