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Requirements: Android 1.6+ Overview: You can measure the length, angle, distance, height, direction. Smart Tools is a toolbox of a collection of 1-4 series. It includes 4 Pro versions that have 14 tools. In a word, All-in-One. Part 1. Length, Angle, Slope : Smart Ruler & Protractor Pro Part 2. Distance, Height, Width, Area : Smart Measure Pro Part 3. Direction, Metal detector, GPS : Smart Compass Pro Part 4. Sound level meter, Vibrometer : Sound Meter & Vibration Pro For more description, see the pages for each of the apps. Do you want to have more features? Feel free to contact me. I'll reply it ASAP. I hope my apps are useful to you. Thanks.