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Dave from Canada asks:
Why would the meter read a negative Carbon Monoxide level? Unit has current calibration (140+ days left). has occurred several times, power cycling seems to work but the malfunction has happened several times

Regarding the following product:
BW Technologies GasAlertQuattro 4-Gas Detector %LEL, O2, H2S, CO - Alkaline Version - Yellow Housing
$987.00
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