The Hakko FR870B-04 is a bench-top board heater designed to elevate the temperature of printed circuit board assemblies so that components on them can be soldered and de-soldered more easily, and with improved results. This is particularly useful on medium to high-mass board assemblies, which can "heat-sink" a significant amount of energy being supplied by a soldering iron tip, or handheld hot-air tool. This tool is particularly useful when soldering Pb-free assemblies.