I'm using a commercial refrigerator with two triple-pane glass doors that I managed to salvage for free from a restaurant that went out of business. I actually kept the fans it came with for circulation (stripped everything else out and sold as scrap metal), and temps were pretty consistent from top to bottom last year. Once I get it up and running this year I'll post on here what it's reading. I also use a temp gun to monitor my temperatures over one of those digital thermometers.