Video coming soonChoose Sound, Camera, Vibration or Spin
Basics · Written steps
Read the steps : Choose Sound, Camera, Vibration or SpinHow to use Tachometer
Steps, videos and tips for the tool.
Measure how fast something turns, in RPM: by sound, camera, vibration or spin.
Watch how it works.
Video coming soon
Getting started
Choose Sound, Camera, Vibration or Spin
Pick how to measure: Sound hears a fan's or engine's hum, Camera counts a strip of tape flashing past, Vibration feels the casing shake, and Spin reads the turn while the phone lies on the turning part.
This is a still image. The how-to video has not been recorded yet.
Read the stepsBasics
Video coming soonVideo coming soonSet the count and save steady RPM
Basics · Written steps
Read the steps : Set the count and save steady RPMVideo coming soonChoose a measuring layout
Basics · Written steps
Read the steps : Choose a measuring layoutStep by step.
Get started
Choose Sound, Camera, Vibration or Spin
Pick how to measure: Sound hears a fan's or engine's hum, Camera counts a strip of tape flashing past, Vibration feels the casing shake, and Spin reads the turn while the phone lies on the turning part.
Choose a measuring layout
Use ⋮ › Screen layout to try the screens: Gauge (a dial, with tips you can drag or fold), Guided (pick what's turning and follow three steps) and Display (a big readout, a 10-second graph and a Tips tab).
Save
Set the count and save steady RPM
Set the count when the way asks for one: fan blades or engine cylinders for Sound, tape strips for Camera. Hold still until the reading says Steady, then tap Save. Saved keeps your readings.
Guided tour
Try these steps in the app. All tour instructions stay readable here.
Choose Sound, Camera, Vibration or Spin
Pick how to measure: Sound hears a fan's or engine's hum, Camera counts a strip of tape flashing past, Vibration feels the casing shake, and Spin reads the turn while the phone lies on the turning part.
Set the count and save steady RPM
Set the count when the way asks for one: fan blades or engine cylinders for Sound, tape strips for Camera. Hold still until the reading says Steady, then tap Save. Saved keeps your readings.
Choose a measuring layout
Use ⋮ › Screen layout to try the screens: Gauge (a dial, with tips you can drag or fold), Guided (pick what's turning and follow three steps) and Display (a big readout, a 10-second graph and a Tips tab).
Get the tool.
Find Tachometer in these apps.
Tips.
Twice or half what you expect? Check the count. Keep the phone, hands, hair and sleeves away from moving parts.