On 09/01/2021 19:41, David wrote:


Cheapest is about £130 (didn't check for VAT and shipping).

Wondering if a cheapo one would be "good enough".
That is, not accurate enough to certify a gas boiler after service or give
a detailed read out but to enough to discriminate between:

Something that is used to officially to certify a gas boiler would need
a calibration certificate and regular calibration to check that it was
still in tolerance. A one off calibration is unlikely to be cheap.

Why do you need something more sensitive or accurate than a fixed room
mounted device? Instantaneous readings are possibly not as important as
the average value over a period of time. All the devices will sound off
quickly when levels get to life threatening levels and after a longer
time if levels stay above the acceptable limit.

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