Quest Q20

The Q20 was Quest's entry into the waterproof mid-range, and the specification was aggressive for the money: full submersion, wireless audio, fast recovery and the 9.5 by 5 inch TurboD coil, which is a small elliptical and therefore genuinely good at separating targets in trash. That coil choice tells you what the machine was aimed at — hunted-out parks and iron-littered sites rather than open fields. The current equivalent is the Quest Q40+.