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John from Cape Canaveral, FL asks:
Can you repair these units in house? I have one here that will not pass calibration. i have done the zero gas calibration and it is fine but when i try to do the span gas if fails. i am assuming that this one will need to be repair. If you can do that please let me know so i can get this one shipped in with a few other Gas alert units i have coming your way.

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