"Doi sau trei metri?"

Translation: Two or three meters?

[MortimerCat]

Are there any rules for writing numbers? eg 1,234.5 (placement of commas etc.)

[MsGeorgia]

Yes, there are. In Romanian commas are used when English uses the point and viceversa. So it would be 1.234,5.

[BaronvonBa1]

gas meters perhaps or more likely length

[InstantSun]

They've used American spelling, which is wrong because as you say, "meters" means gas meters, and the unit of length is "metres". They're separate words for a reason! :)