RPM Meters

3 products

Pocket-sized RPM Meter from Testo

Tachometers, also called RPM meters, are designed to measures the rotational speed of the shaft or disc while the machines are in motion. This hand-held model provides its users with a comfort level to carry it to the desired location. These devices use a light source of a spinning wheel to make measurements. They help monitor any machine or turbine health. In specific applications, traffic speed, volume or flow, angular momentum can also be estimated with these measuring instruments. 

Common Applications of RPM Meter

The typical applications of the Tachometer or the RPM meter are:

  • For measuring rotational speed
  • To calculate the flow of the liquid with the help of an attached wheel
  • Used in the medical sector to measure blood flow
  • To display the rate of engine crankshaft rotation

This crucial instrument conducts essential functions like monitoring motor speed, counting, process control and many others in areas wherever applicable. 

Frequently Asked Questions

This is usually "optical ghosting." If the shaft is reflective or the reflective tape is too long, the sensor picks up multiple pulses per rotation. We calibrate the sensor’s "gate time" to ensure it distinguishes between a true rotation and a surface reflection.

Yes. High-frequency flickering from modern LED or fluorescent lighting can interfere with the optical sensor's pulse detection. Our calibration includes light-interference testing to ensure your tachometer ignores 50/60Hz ambient noise.

Mechanical adapters introduce a "load" on the motor. If the internal bearings of the tachometer are dry or worn, they drag the RPM down. We test the torque-load of the instrument to ensure the tool isn't slowing down the very machine you are trying to measure.

In vibration analysis, a 1% error in RPM leads to a massive error in calculating centrifugal force. Professional certification is required to ensure your "phase" and "speed" data is precise enough to prevent catastrophic bearing failure during balancing.

Non-contact meters are designed for a specific "Cosine" angle. If the angle is off, the laser path length changes. We verify the angular tolerance of your meter so you know exactly how much "tilt" is allowed before your safety data becomes invalid.

Yes. We verify the wheel diameter and the internal math used to convert rotations to linear speed. This is critical for ensuring production lines or safety escalators are moving at the legally required velocity.