1.Stainless steel SUS 340 water tank very easy to cleaning. 2.Gable cover sold separately for your option. 3.PID controller and LED digital display of temperature. 4.The water bath with circulator using electric heat tube to unify temperature inside, and the water bath without circulator using electric heat slice to get heat source from bottom evenly. MODEL SPECIFICATIONS: UH-130D, UH-230D TEMP. RANGE: Ambient+ 5 to 100 TEMP. ACCURACY: ± 0.1 TEMP. CONTROL: PID Control TEMP. DISPLAY: LED Digital Display VOLUME( liter) : 10 , 20 SENSOR: PT-100© INNER DIMENSIONS: 295x235x150 mm, 495x295x150 mm OVERALL DIMENSIONS: 340x280x305 mm, 532x325x305 mm POWER VOLTAGE: 110 V, 60 Hz / 220V, 50Hz WEIGHT( Approx.) : 7, 9