A temp gun is the only way to really be sure that a material is cool enough to touch, without actually touching the material. These tools are great for construction workers, plumbers, general contractors, HVAC technicians, and anyone else who has to deal with hot spots. Getting temperature readings from far distances is now quicker than ever thanks to improved infrared technology. The temp-guns come in different cone measurement ratios which are important to understand when choosing which to buy. A higher ratio means that you can be further away from the material you are measuring while still getting an accurate reading.