Smart tool app is amazing app in which 40+ function are available its application size is 5MB and working 500MB its function are below the post you can try it this app
Ruler, Speed, Light, Sound, Location, Distance, Speed Gun, Compass, Magnifier, Mirror, Protractor, Stopwatch, Metal detector, Vibrometer, Microphone, Tuner, Scanner, NFC Reader, Cardiograph, Dog whistle, Random, Time zone, Thermometer, Drag, Accelerometer, Night vision, Calculator, Counter, Pedometer, Body mass idx, Period tracker, Polygraph, Translator, Notepad, Battery test, Settings, Shortcuts
Tools support both unit formats (metric unit/imperial unit) and several languages. The app supports all device brands (Samsung, Sony, HTC, LG, Huawei, Lenovo, Toshiba and others). However, not all models have the appropriate sensors to support all the tools. It is tested mostly on Samsung, Sony, HTC, LG, Huawei, Lenovo and Toshiba. Feel free to email me if you find any bugs or need any help with the tools.