don't need to buy one...have one...we've been remodelling one part or other of our house for at least 5 years. rite now the once was dining room is gutted and waiting for new wiring, insulation, drywall, floorin, cieling, painting....um well basically a whole room...when i say gutted i mean gutted...we knocked down everything including the lathing. 100 yr old house...lets just say i was sneezing black snot for weeks.