Not to sound mean here, but I will add this... I have a digital thermometer like the one you have posted, the yellow one. Mine has read inaccurate by as much as 15 degrees at times. When I was setting up my new tank, I was over obsessive about getting things right. I had two accurites, that one, and a temp gun. The two accurites and temp gun were all within 2 degrees of each other. The yellow one was 15 degrees off.
Just be cautious.
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