Benchtop 13L constant low temperature water bath with operating temperature range of -10~+ 80 C. Precision control with temperature adjustment accuracy of ±0.1 C. More applications available with larger tank space. Internal / External Circulation can be changed easily. Shelf height is 2 stage adjustable for different flask sizes. Standard equipped with auto stop, auto start, RS485 communication function, temperature output terminal (4~20mA). Enhanced safety features includes self diagnostic function, over-current circuit breaker, refrigerator overload relay, empty boiling prevention float switch, refrigerator protection delay timer function.