Solid-faced metal read head provides electrical contact for iButton® data transfer. Mounts in nonconducting walls or panels. Shaped to self-align with iButton®. No moving parts; withstands rugged environments. The two 15 cm 22 AWG wires are provided for easy connection to the system microcontroller. The probe is fastened behind the panel with a push-on type spring nut and nylon washer which is included. Best suited for stationary reader