WebPhotoelectric Sensor Slot Optical Switch Opto Interrupter Transmissive Infrared + $3.99 shipping Photoelectric Switch Transmissive Slotted Optical Sensor Slot H2010 ST150 GK105A + $3.99 shipping Hover to zoom Sell now Shop with confidence eBay Money Back Guarantee Get the item you ordered or get your money back. Learn more Seller information WebPHOTOTRANSISTOR OPTICAL INTERRUPTER SWITCH H21A1 Datasheet (HTML) - Fairchild Semiconductor H21A1 Product details DESCRIPTION The H21A1, H21A2 and H21A3 consist of a gallium arsenide infrared emitting diode coupled with a silicon phototransistor in a plastic housing.
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