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Metal detector Quest Q40 Combo The Quest Q40 metal detector uses the 13kHz frequency during the research. It is easy to mount and thanks to the three adjustable rods it can be adjusted between 80 cm and 130 cm. It has two search plates: a 9 × 5 "TurboD Waterproof Plate and a 9 × 11" (22.8x28cm) Wide Scan TurboD Waterproof Coil.