Forrest, sensor is the same as the ones in your sidekick, r-22's. Easy to replace
for those that need CO calibration, if you are nice to your local fire department, and they have a bauer fill station, there should be 0 and 20 ppm CO cal gas along with a regulator on the compressor side of the fill station. That's where I calibrated mine. For a short fix, just exhale into it and tell it that it is 20ppm, you will get some wonky CO readings but it will work
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