Weapons equipped or in hand for buffs?

[csb]

Hey everyone, mechanics question: for a weapon with a stat or power level buff on it, do you get the buff just for having it equipped in one of your weapon slots, or does it actually need to be in hand? I'm thinking in particular of the axe that gives + to fire ability power levels for a non-melee wizard, but there are probably other cases where this is relevant. Thanks!