! scope="col"| Restrictions
|-
| '''[[Glossary of EM.Cube's Simulation Observables# Temporal Field Probe |Temporal Field Probe]]'''
| style="width:300px;" | Monitoring E- and H-field components at a fixed location in both time and frequency domains
| style="width:250px;" | Associated with a PEC or thin wire line
|-
| '''[[Glossary of EM.Cube's Simulation Observables# Near-Field Sensor |Near-Field Sensor]]'''
| style="width:300px;" | Monitoring E- and H-field components on a cross section of the computational domain in both time and frequency domains
| style="width:250px;" | Associated with a virtual rectangle strip
|-
| '''[[Glossary of EM.Cube's Simulation Observables# Far-Field Radiation Pattern |Far-Field Radiation Pattern]]'''
| style="width:300px;" | Monitoring the radiation behavior of your structure
| style="width:250px;" | Associated with a PEC rectangle strip
|-
| '''[[Glossary of EM.Cube's Simulation Observables# Radar Cross Section (RCS) |Radar Cross Section (RCS)]]'''
| style="width:300px;" | Monitoring the scattering behavior of your structure
| style="width:250px;" | Associated with a PEC rectangle strip
| style="width:250px;" | Stand-alone source
|-
| '''[[Glossary of EM.Cube's Simulation Observables# Huygens Surface |Huygens Surface]]'''
| style="width:300px;" | Collecting tangential field data on a box
| style="width:250px;" | Stand-alone source