This review is for the Vevor 10L upgraded ultrasonic professional. I received the unit quickly, well boxed with no shipping damage or obvious manufacturing issues.Initially, I filled it with pre-heated, distilled water and set the heat to max; however, I found it is not necessary because the heater does its job very well. It held its temperature over several hours of continuous use and temperature drifts about 3 degrees with a consistent thermostat. The 10L rated unit holds 2 gallons comfortably with enough space for its basket, items to be cleaned, and unit's cover.The ball valve drain was liquid tight, opened/closed smoothly, and the included drain tube was adequate even with hot water.I used several cleaning solutions including Simple Green and Evapo-Rust with no issues and the stainless steel body was easy to clean. Using the glass jar method and stronger solvents produced excellent results.Overall, this is a great ultrasonic cleaner and I am very happy with my purchase.My only regret is that I didn't purchase a larger cleaner.