PI-12 incubator and humidity

[lordhowechicks]

Hi All,
I have just set up my pi-12 incubaor for the first time. Today is first day with 12 egss in it. I am having trouble finding out if this model of incubator monitors humidity or not? If it does, how do I check that, if not, what do I need to buy to monitor humidity?
Cheers in advance

 

[nchls school]

Hygrometers measure humidity. Should be easy to find.