Hey Ticks, I actually bought one of those from TSC ! I had picked up a hydrometer from the reptile section (along with the thermostat) and then because I have everything digital, I picked this themo/hydro up and its exact with the reptile one.
Hope it helps, so far so good on my eggs
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Thanks for the quick response Don!
How much of a difference would it make if it was off by a couple degrees?
The hygrometer/hydrometer is the round guage on the bottom and reads
in percentages. It could be off by 10% and make very little difference in
your hatch rate, unlike temperature.
My favorite hygrometer is an analog one I bought at Petsmart for $5.