The UltraSensor 2 has been designed as a next generationreplacement of Proximity and micro switch systems, for monitoring spool movementin progressive divider elements.
  
A single model will work with all standardSMX, SMP, SMO, nP and nPR+ divider blocks as a screw-on accessory withoutrequiring special arrangement or modification to the spool.

The patentedconcept works by monitoring magnetic flux variations through a Hall-effectsensor as the spool enters the sensing range. There are no moving parts whichmeans the solid state device is completely wear free.

ADVANTAGES:
- Power-on diagnostic LED- Metallic connector
- Short-circuit protection
- Advanced sensing algorithm 
- Interference resistant circuitry more robust than a normal prox. switch!
- Protection against reverse polarity.

Part numbers - Models found