In addition to four transducers, a heating element in the Hot Tub enhances cleaning. Microjets remove carbon and other debris from cartridge cases, gun parts and other metal equipment. With its large capacity, you can even clean a 16" AR-15 upper. Comes with one 1.6-qt. tank to place in the main tank to clean multiple smaller batches or to use different solutions simultaneously. Additional tanks can be added. Hang large objects on the integrated cords to take advantage of the ultrasonic energy. Other features include drain pans in the lids, small-parts basket, a degas function and five temperature settings from 100ºF - 140ºF. Tank capacity: 2.3 gallons.