Andrew Mawson wrote:

But the problem with both that gas interface and opto electricity
interface is that they invite too many questions from the meter
readers - I'm sure that you'll be reported for possible fiddling
attempts with bits stuck all over the meter. That's why I opted for a
separate meter that I modified in series with the boards meter.


I can't even remember the last time we actually had someone round to
read our meters... Even so, it'd be trivial to pull the blu-tack blob
holding the sensor off the meter for the meter read so I really don't
see this as a significant disadvantage, particularly in the context of
the simplicity and low cost.

Mathew