Set of the devices contains:

1x DIG3D.LP.C - 5-24V/NPN/NO

1x DIG-Z.C - 5-24V/NPN/NO

1x SMART.MER/2

1x HOLDER.DIG3D

1x HOLDER.DIG-Z

Wiring:

Power voltage 12-24V

Output from SMART.MER/2 can be wired as PNP/NPN, and configured as NO or NC.