The reverse helix system came from the Archimedes Screw Pump invented over 2

Frequency - 8 kHz

and jewelry

It does not include the Bucket or the battery

Great for reaching fine details and tight spaces

Equinox 700, 900, X-Terra Pro and Elite Environmental Cover AT Pro Accessories The reverse helix system cameMinelab X Terra Pro X Terra Elite Control Box Cover Protect Your X Terra Control Box from Scratches, Scuffs, and Everyday Wear Help keep your detector looking its best with the Minelab X Terra Pro X Terra Elite Control Box Cover. Designed specifically for the X Terra Pro and X Terra Elite metal detectors, this protective cover helps shield your control box from scratches, scuffs, dirt, and minor impacts encountered during regular detecting adventures.