Operating at 40 khz, these ultrasonic cleaners provide aggressive cleaning power. Easy-to-clean, corrosion-resistant 304 stainless steel tanks have no corner welds or other dirt-catching surfaces. The units are enclosed in durable, powder-coated steel skirts. Cleaners with heater and mechanical timer offer greater cleaning capability - ideal for heat cleaning any size parts. Maximum heater temperature is 140°f (60°c). set the cleaning cycle up to 60 minutes or use the hold function for continuous operation. What's included: stainless steel lid, nonskid feet, and a 7-1/2 ft power cord. The 1, 1-1/2, 2-1/2, 3-1/2, and 5-1/2 gallon cleaners have a bottom-mounted drain and include tank drain kits. The 1-1/2-, 2-1/2-, and 5-1/2- gallon cleaners have a quick-disconnect drain. The 1/2- and 3/gallon cleaners have a pour spout. Never use ultrasonic cleaners with Flammable solvents. A cleaning solution must be used with these cleaners. An insert or tray must be used with these ultrasonic cleaners. Ultrasonic activity is greatest starting about an inch from the bottom of the tank. Aggressive cleaning ability in a variety of sizes sturdy, noncorrosive units handle all types of cleaning tasks sweep frequency ensures uniform cleaning activity