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Amazon.com: Diymall Voltage Sensor Dc0-25v for Arduino with Code(Pack of 2pcs) : Industrial & Scientific
Taiss LJC18A3-H-Z/AX Proximity Switch1-10mm Distance Measuring Capacitance Proximity Sensor Switch NPN NC (Normally Closed) DC 6-36V 300mA M18 3-Wire: Amazon.com: Industrial & Scientific
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