Bests & Worsts Reviews from Amazon

This is a great concept but I’m concerned about the accuracy. I used 75% calibration pack to check the calibration as soon as I bought both of the two I own. I bought them new from Amazon obviously and right out of the box they both needed calibration to the degree of +/- 7 degrees. I expected them to be highly accurate and calibrated out of the box for the $50 price. I have had to calibrate both of mine several times over the year or two I’ve owned them. I even had one replaced, due to the battery and not the calibration, and all three I’ve had have been all over the place. For instance I calibrated them both one time together and then placed them in the same place after calibration. Over the course of a few days they were off by more than 5 degrees in a area that was approximately 50% humidity. That being said the temperature readings have always been consistent. That’s the one good thing I can say.