These 5 to 9 gallon ultrasonic cleaners are where "tabletop" tops out. As the largest of the tabletop cleaners, these units are intended for use in large machine shops, auto repair facilities, medical and scientific centers, police stations, armories, or anywhere quick, precise cleaning is needed. Their spacious tank sizes allow for cleaning large parts such as carburetors, or many small parts like racks of surgical instruments.