The constant temperature oil bath is an auxiliary constant temperature experiment instrument, which consists of three parts: a case, a constant temperature oil tank and a temperature control device. This instrument is suitable for evaporation and constant temperature heating in various laboratories. The thermostatic bath is made of imported stainless steel plate and precision machining technology, which has the characteristics of high temperature resistance and corrosion resistance. The temperature control device is designed with high stability operational amplifier, double integral high-precision A/D conversion technology, and far-infrared heating technology. The product has a short thermal equilibrium time and good temperature uniformity, which does not exceed ±1°C. LED display of test data is intuitive and accurate. This product is widely used in distillation, drying, concentration and warming chemicals or biological products.