According to the Raytek Corp. (Santa Cruz, CA), its pocket-sized MiniTemp can be used to monitor climate control systems, balance room temperatures, check supply-return registers, and test ductwork for efficiency. The product is designed to measure temperatures accurately up to 6 ft away with the range of 0 degrees to 500 degrees F. Features include C or F temperature-selectable switch, backlight, low-battery indicator, automatic off, and a 7-sec hold on the display after trigger release. Two models are available.