+2 for staun.
they are easy to set and keep the setting for quite a while until they get enough dirt in them and then you have to clean them. best practice to keep them clean: before attaching them, use the small end to push the valve stem and purge a little air to clean out the valve stem of dirt and dust, then attach the deflators, this will keep dirt out of the deflators so you dont have to clean them as often.