What are you looking at spending?
$60 with a 12:1 ratio
http://www.reptilebasics.com/412l-thermometer.html
$125 with 20:1 ratio
http://www.reptilebasics.com/420l-ir-thermometer.html
$240 with 50:1 and case
http://www.reptilebasics.com/425l-ir-thermometer.html
Those ratios how many inches away to how many inches it reads. So for the 12:1 it reads a 1x1 square inch for every 12 inches the temp gun is away from it's target.
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