Bests & Worsts Reviews from Amazon

I wanted to calibrate my oven and wasn't sure about my thermometer - so i purchased several others to double [quadruple] check. CDN was one of 4 'cheap' thermometers I purchased and tested. [Yes, I had some free time over the holidays. And yes, I'm a nerd] CDN was the only thermometer that was off by more than a few degrees. CDN was off by ~10% (measured too low). Instead of 350F, it showed a bit less than 320F. All the other ones were within about 5 degrees of the average of ~350F. Admetior (355), Rubbermaid (350), goodcook (345) and Taylor (345). Interestingly, CDN's description/packaging also had the most comments about how accurate it was ['Pro"]. By the way, my 25-year-old oven was off 25 degrees as we had suspected (actual temp lower than indicated)...so check yours!