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Amazon.com: 2pcs DC 5V NPN NO M12 4mm Sensor LJ12A3-4-Z/BX Inductive Proximity Sensor Switch for 3D Printer CNC Z Probe auto Bed Leveling : Industrial & Scientific
Amazon.com: Inductive Proximity Switch, Smart Chip Inductive Stroke Limit Switch Fast Frequency Response 5‑36VDC High Repeat Positioning Accuracy for Engraving Machine : Industrial & Scientific