We have a distillation column with insufficient temperature tappings. In order to do a rough survey of the temperature profile externally an idea is to drill small (say 1 inch) holes in the insulation and take external temperature readings. Would a IR temp. gun like this one be a good idea? http://www.thermoworks.com/products/ir/irgun.html#AccessoriesTab Any other ideas? Anyone try anything similar? THe unit mentions an ~2% accuracy, is it really that good?