magnetic detector
nounUK /mæɡˈnetɪk dɪˈtektə/
US /mæɡˈnetɪk dɪˈtektər/
A magnetic detector is a tool that finds hidden metal or magnets.
The guard used a magnetic detector to check the bags at the door.
OTHER MEANINGS
2. An early radio receiver that used a rotating iron band to detect wireless signals.
Marconi's magnetic detector helped ships receive radio messages.
3. A device in physics labs that senses changes in a magnetic field.
The students used a magnetic detector to measure the magnet's strength.
4. A security tool that beeps when it senses metal objects.
The magnetic detector beeped when the keys passed through.