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Gunson's Gas tester

digital exhaust CO analyser with pulse pump professional edition, digital display for CO level, volts, rpm, dwell.
This gas tester requires just DC 12 Volt and can be simply run off a regular car battery. The pulse pump just uses the pressure built up within the exhaust system, there actually isn’t a moving part that could wear out or needs to be cleaned. Water gets separated in the built-in water trap. It is accurate to 0.5 % C.O. measurement and can be easily calibrated in air.