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Apr 17, 2024 - 01:49 PM
Most likely the unit has a bad oxygen sensor and it needs to be replaced. As old as M40 units are though, I'd put the all the sensors through a check at this point.
Why is there no reading in the oxygen space on my meter
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Open Jan 13, 2024 - 07:09 PM
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M40 Gas Detector Information
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