Metal Detector was created by The Plumber's grandfather, this device could detect bolts hidden underground. The hidden bolts were sucked up by the device. Whenever hidden bolts were in range of the device you could take them out. It would have red or white beams showing how close you were to the bolts accompanied by a sound which also indicated proximity. The closer you were the redder the beam and the Metal Detector would beep louder. However, in the HD version of the game the sound it made was too high-pitched to show how close to the bolts you were, making the only indication of proximity the color of the beam.
- Ratchet & Clank (2002 game) (first appearance)