How do you know if you have enough air flow in your incubator?

[temple1612]

Are there signs to look for? I think I have enough, but how do you know for sure?

 

[Spartan22]

My Brinsea has it calibrated on its own with the the fan going, doesn’t your incubator has its fan?

 

[temple1612]

My Brinsea has it calibrated on its own with the the fan going, doesn’t your incubator has its fan?

I use a DIY incubator. It works very well, but I am just curious.