Scuba divers - advice please for beginners/kids dive computer

[Squ1ggle]

DS is 10 and learning to scuba dive. He's been having pool lessons since Christmas, completed the PADI seal team and is now doing his open water (he's passed the pool competency and theory work and his 1st open water dive is tomorrow)
He's taken to it like a duck to water and is keen to continue. Thankfully we've found a lovely local dive group for him as DH and I don't dive.
We think his own dive computer would be useful as he'll be doing lots more open water with the group next year so have suggested he clubs together his own birthday and Christmas money plus a contribution from us.

Can anyone please suggest a decent option that is easy to use and isn't too large for his skinny wrists? We don't really have a clue what we're looking for.

TIA

I wouldn’t at 10. Where are you? Only asking as I grew up in the ME and diving was amazing, it’s too bloody cold although vis was better than I expected. He might dislike being cold and only want to do it somewhere warm.

i think he’ll struggle to get something small enough.

Oh it'll definitely get used, that's not a problem. I was just looking for suggestions of a model but thank you