CARBON MONOXIDE ONLY ► This is the perfect option if you have already a supported Oxygen sensor or if you are not yet diving Nitrox but might in the future. You will receive a fully assembled cootwo and will save $50 from the list price of $249.99. This option does NOT include the Oxygen sensor. We will also send project updates and mention you on our site. Free shipping in US only. See project description for more details.

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