(1) Constant temperature solution: the constant temperature medium has good fluidity, good heat transfer performance and high control sensitivity, so the accuracy is high; The electric contact thermometer has small heat capacity and is sensitive to temperature changes, so it has high sensitivity

(2) Thermometer: if the heat capacity of the thermometer is small, the contact area with the constant temperature solution is large, and the adhesion between mercury and platinum wire and capillary wall is small, the accuracy is good.

(3) Heater: on the premise that the power is enough to supplement the energy lost by the incubation bath to the environment per unit time, the smaller the power of the heater, the better the accuracy. In addition, the smaller the heat capacity of the heater itself, the higher the heat conduction efficiency of the heater tube wall, and the better the accuracy.

(4) Relay: the relay electromagnetically attracts the key. The shorter the mechanical action time of the latter, the smaller the residual magnetism of the iron core in the coil when the power is cut off, and the higher the control sensitivity.

(5) Agitator: the mixing speed should be large enough to make the degrees Celsius of all parts of the thermostatic solution as consistent as possible.

(6) Others: the smaller the difference between the ambient temperature and the set temperature is, the faster the mixer speed is, and the better the temperature control effect is