Crest"s Powersonic rugged industrial-strength performance gives you consistent quality at benchtop price Crest offers more sizes and options than anyone else. Powersonic ultrasonic cleaners are available in seven sizes; from half gallon to gallons (1.75 to 26 liters); in three different configurations. Lifetime heater warranty. year warranty on parts and labor. Main on/off switch. Analog model with timer. Analog model with timer and adjustable thermostatically controlled heater. Digital model with timer; heat; power control and degas. All timers have continuous-operation capabilities. Cover included with all units. Crest"s exclusive Powersonic feature ensures uniform cleaning throughout the tank by sweeping the ultrasonic frequency kHz; creating overlapping ultrasonic waves. This eliminates inconsistent cleaning due to hot spots (areas of intense ultrasonic activity) in the cleaning solution; caused by the unvarying or standing waves produced by conventional ultrasonic power supplies. MORE POWER TO YOU