Fluke 931 Contact and Optical Tachometer, 1 to 99,999 rpm
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Prices updated: 14 Oct 2026
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About this product
A handheld tachometer combining non-contact optical and contact measurement for checking the rotational speed of motors, shafts and machinery. Optical measurement works at a sensing distance of up to 500 mm, while contact measurement requires direct contact with the rotating shaft. It offers an accuracy of ±0.02% of reading plus 1 digit.
Specifications
- Optical speed range
- 1 to 99,999 rev/min
- Contact speed range
- 1 to 19,999 rev/min
- Accuracy
- ±0.02% of reading + 1 digit
- Optical sensing distance
- 500 mm
- Storage temperature
- -20 °C to 70 °C
- Weight
- 250 g
Frequently asked questions
When should I use contact mode instead of optical mode?
Use contact mode when you can place the tip directly on the rotating shaft. Use optical mode when the target is not accessible or when you want to measure without touching the moving part.
Are there surface requirements for optical readings?
Optical readings depend on the target surface and its reflectivity. Refer to the user manual for the recommended surface preparation and measurement setup.
