Not sure if this is the right place for this but here goes
I have a dive bottle but not sure if its still in test it has a reg sticker on with 2007/11 stamped in it is this the last test date or due date and how long does a test last on a dive bottle is it 5 years
Dive tanks are tested in 2-1/2 year cycles if iirc (visual/hydro/visual etc.) so, yes your's is due a test and any dive shop/centre you take it to for a refill won't fill it until it has been.