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Top-class tachometer

In terms of speed measurement, high-precision, optical methods have established themselves in place of mechanical ones. There is a distinction between two measurement methods when it comes to optical speed measurement:

  1. Reflection of an LED or laser light beam.
  2. Light barrier.

Speed measurement with Testo – all-round efficiency:

  • A large selection of digital tachometers and strobes – the ideal instrument for every task.
  • High-precision speed measurement using optical methods. 
  • Measured in next to no time: strobe and tachometer with easy and efficient one-hand operation.
  • Outstanding quality from the market leader for an unbeatable price-performance ratio.

From laser tachometers to strobes – the optimum measuring instrument for every requirement

With reflective markers
With reflective markers

Non-contact speed measurement with self-adhesive reflectors.

Strobe (without reflective markers)
Strobe (without reflective markers)

Extremely wide measuring range, extremely short flash duration, extremely precise speed measurement.

Stroboscopes - available versions
Stroboscopes - available versions

Speed measurement with a LED stroboscope or xenon stroboscope.

Laser tachometer or LED: which is better?

In the reflection method, a laser or LED light beam is emitted onto the measurement object. The reflected beam is registered as an impulse by the measuring instrument's optical sensor. Depending on the measurement requirement, a tachometer either with a laser or with an LED is more suitable. The differences:

LED light source

  • The circle of light is slightly diffused by a lens. This offers a larger measuring area, depending on the distance.
  • LEDs have less luminous intensity: this means they cannot record measurement objects that are further away.

Laser light source

  • The higher luminous intensity and luminance of the laser tachometer enable more distant objects to be recorded as well.
  • Accordingly, the measuring area is really small.
  • A laser tachometer must therefore be held very still.

This is how to see that the tachometer is digital:

digital tachometer shows the measurement data on the display in figures. In addition, minimum, mean and maximum values can be saved, as can the last measured value.

Professional tips for speed measurement – with a strobe too

Rev counters are used in a huge number of applications. The most common include speed measurement on fans in air conditioning and ventilation technology, measurements on conveyor belts using an adapter or counting pulses on conveyor belts in industrial production. And no matter whether it is a rev counter or strobe – Testo's measuring instruments are intuitive to operate and provide high-precision measurement. And with a few little tips from the professionals, you can improve your speed measurement even more:

  1. Cleanliness
    You must always ensure cleanliness for speed measurement. Both in terms of the sensor technology, because dirt particles in the sensor can falsify the measurement results. But also when applying the reflective markers, you should ensure that there is no residual dirt, such as oil, on the measurement object. A sticker that has poor adhesion can easily detach at high speeds and prolong the measuring process.
  2. Minimum distance
    In order to ensure optimum recording of the measurement object (e.g. a shaft) by the tachometer, it should not be too far away. At the same time, always think of your own safety – it is absolutely essential to keep to a minimum distance from the moving object in order to rule out any injuries.
  3. Reflective stickers
    Avoid unwanted reflections which falsify the measurement result by using a reflective sticker. In most cases, reflective stickers are included in the scope of delivery for a digital tachometer.
  4. Strobe
    A strobe is ideal for measuring, checking and monitoring small parts that vibrate, rotate very fast and are difficult to access. This involves the strobe creating a static image of the rotating object using a flashing lamp. The flashing frequency of the lamp is increased or reduced until it matches the rotational frequency. This means the flashing frequency and frequency are identical.
  5. Standards and directives
    There are no standards and directives to comply with for tachometers in the area of handheld instruments. These only apply to stationary tachometers, such as those used in mechanical engineering.

Strobe, tachometer and other important measuring instruments

Optical tachometer – to the product overview

Discover Testo's wide variety of optical tachometers  and  strobes with just one click.

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