Smart Tools is a complete package of 5 app sets. It includes 5 Pro sets for a total of 15 tools. In a word, All-in-One. Set 1: Length, Angle, Slope, Level, Thread – Smart Ruler Pro Set 2: Distance, Height, Width, Area – Smart Measure Pro Set 3: Compass, Metal detector, GPS – Smart Compass Pro Set 4: Sound level meter, Vibrometer – Sound Meter Pro Set 5: Flashlight, Magnifier – Smart Light Pro For more information, see the manual [...] Free Download