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No there is NO decimal point....
I'm an EMT. So for reference on CO levels (for the readers, not the OP, since you have the meter I think you know this already):
100 - 200 parts per million (ppm)
Dangerous: Medical Alert. Emergency conditions exist. Actions: Evacuate the building immediately and check occupants for health symptoms. Advise all occupants to seek medical attention. Occupants should have someone else drive them to a medical facility. If occupants exhibit symptoms of CO poisoning, emergency service personnel must be called. Evacuation is important, but Analysts must not subject themselves to excessive conditions. Maximum exposure time is 15 minutes. Open all doors and windows that can be done quickly. If the home has an attached garage, document CO levels in garage. Disable combustion appliance operation. Continually monitor indoor ambient levels while moving through the building. Once the atmosphere within the structure has returned to safe levels and the appliances have been turned back on, locate the source of CO production for corrective measures.
that is crazy our compressor samples the air coming in and if it reads anything then it cuts off the compressor
of course we fill scba bottles as well as scuba our air is rated medical grade ..