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Klein Tools Non-Contact Voltage Tester with Infrared Thermometer NCVT-4IR - The Home Depot
Klein Tools NCVT-4IR is a voltage tester that provides non-contact determination of AC voltage in cables, cords, circuit breakers, switches, outlets and wires; as well as infrared (IR) thermometer measurements,
Print a 1x1 grid and tape it to your build plate. Preheat for at least an hour. Use the $30 probe to measure the actual temp of each grid intersection. My build plate has a sweet spot about 1-1/2" right of center. The four platen height knobs were each small cold spots.