Safely determine temperature readings from a distance. ToolSmart™ mobile app can be used for quick storage of readings. Organize your findings by project for easy reporting. Use phone as a second screen for easier visibility and to simplify two-person jobs. 12:1 distance-to-spot (D:S) ratio. Hi-visibility white on black display. Automatic power-off trigger activates after one minute of inactivity. Great for identifying hot or colds spaces in the home.