Safely determine temperature readings from a distance; conveniently use your phone as a second screen for easier visibility and to simplify two person jobs; quickly save your readings to the "ToolSmart" app on your phone; organize your findings by project for easy reporting; stop wasting energy in your home - find drafts, save money, be more comfortable; temperature range: - 40  to 1076 F (-40  to 580 C); 12:1 distance-to-spot (D:S) ratio; hi-visibility white on black display.