The ZWO EAF Temperature sensor can be connected to the ZWO EAF Motor Focus to enable an automatic compensation of the focus drift caused by changes in ambient.
As the temperature changes over an imaging session, the focal point will change. The ZWO EAF Temperature Sensor when used with appropriate software will compensate and keep you star images pinpoint.
Note: You can only connect the temperature sensor OR the hand controller to the EAF at one time.