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Amazon.com: Heschen M12 Inductive Proximity Sensor Switch Non-Shield Type LJ12A3-4-Z/BY Detector 4mm 10-30VDC 200mA PNP Normally Open(NO) 3 Wire : Industrial & Scientific
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Amazon.com: Heschen M18 Capacitive Proximity Sensor Switch Non-Shield Type LJC18A3-B-Z/AX Detection 10mm 10-30VDC 200mA NPN Normally Closed(NC) 3 Wires : Industrial & Scientific
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