Best Incubator Thermometer & Hygrometer?

[Scifisarah]

I am always worried that the thermometer/hygrometer combo I use in my incubator is not very accurate. I was wondering what you all use, and where do I buy one? I am using one intended for cigars right now, but I think it got wet at some point and is not reading the humidity correctly.

 

[SarahFair]

I got my $7 combo from walmart. It works fine.
There is a test you can do to calabrate them. You can find it easy in a search