From Smart Tools co.:
Smart Tools is a complete package of 6 app sets. It includes 6 Pro sets for a total of 15 tools. In a word, All-in-One. Set 1: Length, Angle, Slope, Level, Thread - Smart Ruler ProSet 2: Distance, Height, Width, Area - Smart Measure ProSet 3: Compass, Metal detector, GPS - Smart Compass ProSet 4: Sound level meter, Vibrometer - Sound Meter ProSet 5: Flashlight, Magnifier, Mirror - Smart Light ProSet 6: Unit - Unit Converter ProFor more information, watch YouTube and visit the blog of the apps: http://androidboy1. blogspot.com/Do you want to get more tools and features? Please send an email. firstname.lastname@example.orgI hope my apps are useful to your SMART Life. Thank you. No internet support : You can open this app without any connection. After installation, open the app 2-3 times with your device connect to WI-FI or 3G/4G. This app does not support the devices that have NO magnetic sensor (e. g Galaxy J7, HTC Desire V, Micromax). This app does not support Google Maps and Currency rates due to the lack of internet. Google has recommended this app as one of the essential apps of Google Play for Education.