Visible Laser JR31-20N Photoelectric Switch Sensor
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A visible laser photoelectric switch sensor can detect obstacles up to 200mm.
Compares to normal Proximity sensor such as GP2Y0A21YK0F The most advantage for this sensor is its visible laser, that the sensor can detect small items, or even via a small as if the visible light can get the item. Besides, the on/off speed would be very fast, 2ms makes it available for special projects such as quantity counting.