Stroboscope app v11.1 - Added optical tachometer. Use it from MENU - TACHOMETER. The app analyzes moving object and determines frequency in Hz and RPM. How to use: - point the camera to the object and press START - hold steady for 5 seconds - result is shown in Hz and RPM v10.8 - add up to 5 buttons for fast setting of favorite frequencies or RPM - alternative strobe method in Settings - Use alternative strobe method