Are the batteries low? That can cause it to read off. Also be sure to keep the lens clean. In the PE-2, that is the plastic piece recessed on the front. A qtip and rubbing alcohol is all you need.
The E setting should stay at 95E for all of your reptile temp uses.
But also consider the Distance to Spot ratio (D:S). On less expensive units, it is typically 1:1. That means at one inch away, you are measuring a one inch spot. At 6 inches away, a 6 inch spot.
With the PE-2, the D:S ratio is 6:1, so at 6 inches away just a ONE inch spot. At a foot away, a 2 inch spot.
You could see a difference in measurement if one unit is measuring a 6 inch area, and the other just a one inch area, make sense?
Feel free to contact me directly if you have any other questions!
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