Check the turn?

[SparkyDog]

Without a reliable WTSD read, I'd check behind here. As a poster earlier mentioned, he's pretty tight which means he's less likely to be pairless after he calls the flop, and that nine hits a lot of hit potential holdings that might checkraise you here. The pot's not huge, so it's not a disaster to give a free card to a draw, and he's not likely to bluff since he's so passive. So I would check.