Strobo RPM Hz Light - Faster, Lighter, Cheaper.Can works with RPM and Hz.Range: 0.1 Hz to 80 Hz. ( the maximum depends on the mobile, processor, memory, cam light, etc.)This app can't substitute precision devices or machines.The precision of this app depends on a lot of things like processor, memory, active apps, mobile, flashlight hardware, etc.DON'T HAVE PUBLICITY, BANNERS, ETC.