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About to do a Landlords inspection on a Halstead ACE HE30 - first time working on a Halstead. Looking at MIs CO2 (Max) is quoted as 9.2% +/- 0.3. There's no absolute CO levels included in the data but the CO/CO2 ratio (Max) is stated as '0.0003 +0.005'. Can this be right? A ratio of 0.0003 with CO2 at 9.2% would suggest that CO (Max) is only 28ppm !!! Also I've not come across CO/CO2 ratio presented this way before - don't understand what the '+0.005' means (presumably it's a tolerance but what does it mean?). Maybe I'm missing something but before calling Halstead's 0844 number, I wondered if anyone else had come across this - any help would be greatly appreciated.