Temperature metal bath (refrigeration type), also known as constant temperature oscillator, constant temperature incubator, or oscillating constant temperature metal bath, uses a brushless DC motor and micro-processing technology combined with intelligent PID. It can quickly and stably maintain the target temperature after reaching it, saving waiting time and combining constant temperature and oscillation functions perfectly, greatly shortening experimental operation time and improving work efficiency. It is an ideal automated tool for sample incubation, catalysis, mixing, and preservation during reaction processes. The constant temperature oscillator has multiple functions such as heating and oscillation.