Free Tools
Free tools for the reliability curious
Handy engineering tools for the plant floor — tachometer, level, vibration and noise meters, and more on the way.
Strobe Tachometer
Flash the phone light at a target frequency to read RPM, Hz or CPM.
Frequency (Hz)
10.00 Hz · 600 RPM · 600 CPM
step
±0.10 Hz
Step multiplier (×0.1 Hz base)
Best on a mobile phone. Tapping Start asks for camera permission — the flash only blinks while the camera stream is active. Adjust the frequency until the rotating part appears frozen, then read the value in your chosen unit.