Amazon.com: DIGITEN 110V-240V 6-Digit 0-999999 LED Display Digital UP Counter+Inductive Proximity Switch NPN Sensor+Holder : Industrial & Scientific
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: uxcell 2mm Inductive Proximity Sensor Switch Detector NPN NO DC 6-36V 200mA 3-Wire PR12-2DN for 3D Printer Probe Bed Leveling,MCU Board : Industrial & Scientific
Amazon.com: Baomain Capacitive Proximity Sensor Switch LJC12A3-5-Z/AX NPN NC DC 10-30V 200mA 1-5mm Blue : Industrial & Scientific
Amazon.com: uxcell 8mm Inductive Proximity Sensor Switch Detector NPN NO DC 6-36V 200mA 3-Wire TL-N8ME1 for 3D Printer Probe Bed Leveling,MCU Board : Industrial & Scientific
Amazon.com: uxcell 4mm Inductive Proximity Sensor Switch Detector NPN NO DC 6-36V 300mA 3-Wire Cylinder Type LJ12A3-4-Z/BX for 3D Printer Probe Bed Leveling,MCU Board : Industrial & Scientific
Amazon.com: DIGITEN Hall Sensor Proximity Switch NPN 3-Wires Normally Closed NC with Magnet : Industrial & Scientific
Amazon.com: Taiss 2PCS M12 4mm Sensing DC 5V NPN NO(Normally Open) 3D Printer LJ12A3-4-Z/BX-5V Cylinder inductive Proximity Sensor Switch Work Voltage 5VDC Special for MCU : Industrial & Scientific