Here I recommend one from MiniInTheBox Company, a professional company focus on this kind of product.
Brief Introduction of Infrared Radiation Velometer Photoelectric Sensor Module for Arduino - Black
Key FeaturesFeatures: - .Brand new Infrared Radiation Velometer Photoelectric Sensor Module for Arduino
- .One-way signal output
- .Effective signal output: Low level
- .Suitable for counting motor speed, workpiece counting etc.
- .Great for DIY project
- Specifications: - .Material: PCB
- .Working voltage: DC 5V
- .Color: Black
- .Package Dimension: 32*20*19mm
- .Weight: 7g
- Package Included: - 1 x Infrared Radiation Velometer Photoelectric Sensor Module Specifications
... [Full description on MiniInTheBox]

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