Opto sensors can be used wherever you need a detection device. Placed strategically, the sensors are activated when the face of the switch is covered, blocking out the light. Good for all scales.
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![Miniatronics Opto Sensors [4 pcs] MNT48G3001](http://midwesthobbies.com/cdn/shop/files/39-001-L_535x.jpg?v=1711410245)
