The grey one on the right is the more likely candidate. However, if you’re on FiT then there’s a third meter - the Generation Meter and that’s the one you’re actually looking for.
It does look as though the PV System isolator is linked into the grey meter bottom right.
It’s possible that that is being used as a generation meter (which is what you want for your FIT reading).
Looks like you’re on an Economy 7 tariff (or similar). Does the main meter (centre, cream colour) have your electricity readings for peak and off peak?
I’m not going to lie, I really don’t know what I’m looking at or what the figures are that OVO want for FIT readings.
As I scroll though pressing the blue button I have
t 10:08:59 (guessing that’s the time but wrong as it’s 1103)
0 40760
d 11.10.23
1 01346
2 39413
Does that make any sense to anyone please?
On that meter, below the blue button, there’s a list of what each of those are.
0 is total kwh
1 is rate 1 kWh and
2 is rate 2 kwh
if you add the readings for 1 and 2 together you will see that they add to the reading for 0
Are there any clues with a previous reading or serial number to check against?