depends on your intended use
The little 55psi pump will get you by for just spotting, its more the little vac they fit to many of these is weak as hell .
I have the sandia derived one that many of them sell , like alltec , cleansmart , cleantalk and a few more .
Its fairly useless though and rarely leaves the van .
I should have got a tweaked version alltec sell for a bit more , called the extreme
https://www.youtube.com/watch?v=yopk2XeGqQcThere are a few other spotters from , mytee , amtech i haven't tried but the specs seem fairly low on them all .
If you want to do a whole room as distinct from an occasional spot you need a bigger machine.
