Smart Tools® mini is a new packaged app optimized for devices without a compass sensor (magnetometer). A half of new Android devices have no compass sensor (Moto G4, Galaxy J, Galaxy TabA ...). Surely this app will work well on all of Android devices. * The differences between "Smart Tools" and "Smart Tools mini" (1) This app does not include compass and metal detector. (2) This app includes currency feature with internet connection. (3) "Sound Meter Pro" is replaced by "Smart Meter Pro". Luxmeter is added. (4) "Smart Measure Pro" is replaced by "Smart Distance Pro". * It includes 6 sets for a total of 16 tools. Set 1. Smart Ruler Pro : ruler, protractor, level, thread Set 2. Smart Meter Pro : sound meter, vibrometer, luxmeter Set 3. Smart Light Pro : flashlight, magnifier, mirror Set 4. Unit Converter Pro : unit, currency Set 5. Smart Distance Pro : distance, speed Set 6. Smart QRcode : QRcode reader For more information, watch YouTube video and visit the blog. I hope my apps are useful to your SMART Life. Thank you. * It is a one-time payment. The app price is charged only once. ** Off-line support: You can open this app without any connection. After installation, open the app 1-2 times with your device connect to Wi-Fi or 3G/4G.