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Testo 477 LED Stroboscope

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Extremely wide measurement. Very high light intensity and ideal for robust applications.

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Product Description

Inspections and quality control of machines and systems, rotational speed measurements of hard-to-reach, small and fast-moving objects. And all while the machines are still running. No problem. No problem at all. With the testo 477 LED stroboscope.

  • Extremely high measurement range: up to 300 000 flashes per minute (fpm)
  • Very high illumination: up to 1 500 Lux
  • Long operating times: battery power for up to 5 h
  • Trigger input and output for connectivity to external systems and control via external sensor

Product description

The testo 477 LED stroboscope makes stunningly fast movements look as if they are taking place in slow motion. This allows you to check and inspect machines and systems while they are still running, and measure speeds of up to 300 000 rpm.

It is impossible to tell with the naked eye if the thread guide of a knitting machine is working properly. It therefore equally impossible to tell if there are any irregularities in vibration or rotational processes of machines or systems. But it’s a different story with the testo 477 LED stroboscope. That’s because the stroboscope emits a series of flashes which makes what you see appear as a “frozen image”.

The testo 477 LED stroboscope can also measure the rotational speed of very small and hard-to-reach objects. And because there’s no need for reflex marks, there’s no need to stop the machines and no disruption to production processes either.

LED stroboscope – technical features

An extremely high measurement range of up to 300 000 flashes per minute (fpm) and a very high illumination of up to 1 500 Lux allow you to carry out rotational speed measurements of up to 300 000 rpm. A trigger input and output ensure connectivity to external systems and control via an external sensor.

The LED stroboscope’s integrated impact protection and sturdy IP65 rated housing (which also allows it to be wiped down) ensure that the testo 477 can stand up to the rough and tumble of everyday use. And thanks to a longer battery operating time, you can carry out uninterrupted measurements for up to 5 hours.

rpm - LED

Technical data 

Measuring range

30 to 300000 fpm


0.02 % of mv


±0.1 (30 to 999 fpm)
±1 (1000 to 300000 fpm)

General technical data

Technical data 

Protection class


Flash duration

Can be adjusted

Flash intensity

1500 Lux at 6000 FPM / 20 cm

Flash colour

Approx. 6500 K

Battery life

NiMH rechargeable battery: Approx. 11 h at 6000 fpm;

Batteries: approx. 5 h at 6000 fpm (3 x AA)

Display type


Display size


Reverse battery protection


Low level

< 1 V

Maximum current

50 mA

Additional Information

Additional Information

Application Emissions, HVAC, Indoor Air Quality, Pharmaceuticals & Hospitals, Production & QA , Refrigeration, Storage & Transport


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