VEVOR Ultrasonic Cleaner with Digital Timer & Heater, Professional Ultra Sonic Jewelry Cleaner, Stainless Steel Heated Cleaning Machine for Glasses Watch Rings Small Parts Circuit Board (10L)

The maximum water level line is at the position of the inner channel step. There is no minimum water level line, but dry burning should be avoided. It is generally recommended that the liquid level be higher than 30 mm.