Cold Trap Bath is a chemical experiment apparatus commonly used in laboratories, industrial research facilities and examining rooms of general hospitals. It has a digital controller with digital display that precisely regulates temperature, which is also very effective in condensing moist or oil mist when using with vacuum drying oven or rotary evaporator. By condensing oil mist, it extends lifespan of vacuum pump and achieve high performance, also, over current breaker activates automatically and protects equipment.