these are w3001 thermostat which is made for maintain cooling and heating by heater or by a fan but sometimes it is relay overshoots the set temperature, so to overcome we will put a safety layer of another w3001 which will control the first controller which maintain the heater or fan so even if one controller goes faulty other will keep working which will ensure the temperature doesn't rise up from the limit especially in incubator and brooder.

#w3001 #thermostat #wiring