Wohler A 400 Pro Combustion Analyzer 3359 Gas Set is the multi-functional instrument for residential and light commercial applications. Wohler A 400 PRO Flue Gas Analyzer with traditional probe and hose assembly. Made in Germany. Free ground shipping within continental US.
Proposition 65 Warning for California Residents: This product can expose you to chemicals including Benzene, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to 
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Replaced by Yellow Jacket CA502P