I'm not looking to be 100% accurate to be fair, BUT it does seem to correlate well with the BBC Weather for this area.
SO on BBC weather its saying 10c and my temp 9.5c
and over the last 6mths , seems to match those readings , indoor is accurate as we have a mercury thermometer next to the sensor and they match OK too.
BUT as i say , after various forums and advice from members like Mandrake I understood the sensor pack was always going to be a compromise, but for a Davies I was looking at £1500+ !!!!
We also back onto a PARK and to the north of that a large field, and 0.5Km from the sea , with just bungalows between us and the sea.