:Product descriptionhigh-quality soil sensors to detect soil moistureyou can control a wide range of soil moisture, the corresponding threshold adjustment
PHOTOTRANSISTOR OPTICAL INTERRUPTER SWITCHDESCRIPTIONThe H21A1, H21A2 and H21A3 consist of a gallium arsenide infrared emitting diode coupled with a silicon phototransistor in a plastic
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