My daughter gave me a Pentel waterbrush and today I tried it out.
It's different from the Tria re-fillable marker I've been using as a waterbrush until now. The water runs more freely, it's a lot easier to squeeze water out of the brush, and the brush gives better control - finer lines, and just generally more precise brushwork.
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I'll have to practise a bit with this brush to get used to the way it dispenses water though, as I've gotten used to the Tria and having to squeeze hard to get anything stronger than a slow trickle - my technique means I'm being inundated with this new brush!
You can see how the washes are thin and runny in this. It also took me much longer to do, but no doubt I'll become reasonably proficient with the new brush in a little while - if I practise.