yep yup, you will need to calibrate every year as well to make sure they are running correctly still. We fired up over a month ago now, calibrated, test hatched with some chicken eggs and now rolling through the ducks again through next June.
You can set multiple thermometers around the inside as well to make sure there are no hot/cold spots.
You can set multiple thermometers around the inside as well to make sure there are no hot/cold spots.