synchronoscope
/sɪŋˈkrɒnəskoʊp/
noun
- An instrument that shows whether two alternating currents or systems are in sync (happening at the same frequency and phase).
- The electrician checked the synchronoscope before connecting the generator to the grid.
- The old control panel had a synchronoscope with a spinning dial to indicate synchronization.
- A synchronoscope helps engineers match the phase of two power sources safely.