I think the topic of thermometer's has been discussed here but I can't find the discussion.
I'm looking to start another hatch today and was warming up my incubator and decided to check my thermometer. I artificial inseminate my dairy cows and had a card thermometer that is used in the water batch where the numbers illuminate when it reaches a certain temp. I also had a few dial thermometer's also for the water batch. All say a different temp. I read on another thread about calibrating in a ice water batch. Is that the way to go or are there better ways to calibrate with a higher temp?
Buy a Brinsea spot check. They are very accurate.
Also, they are made for incubation use--They only read a small range of temps because of that. A lot of people over the years have been amazed at how better their hatches go when they use one.