The TPI 707 is used to test flue gasses at home or office spaces for the presence and location of CO leaks.
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72-10250 - Amp Plus True RMS Digital Clamp Meter
The TPI 293 is a clamp-on plus DMM that offers measurements in all basic electrical functions plus bar graph, TRIM mode, peak mode, sleep mode and data hold. Measures AC/DC volts, resistance, continuity and frequency.
72-10255 - High CO Analyzer
The TPI 706 measures from 0~10,000ppm making it useful for testing forklift exhaust for carbon monoxide leaks. Capable of performing ambient and flue gas checks with the included hot air probe and internal pump.
I have dealt with MCM Electronics a number of times and have been more than satisfied.