The Hall-O is a Hall Effect Sensor PCB.  It reacts to magnetic forces & is normaly used as a non-contact distance measurement device.  These sensors will also work for 3D Printer endstops.

The kits are offered two ways, SMT components pre-soldered (default) or DIY assembly w/ SMT components.  Both kits come with a 1m (39.37") cable.

You can view the schematic page of this PCB here.  More information is also available on the RepRap Wiki.

This product designed by MaukCC.