Passive Metal Detector - Paw patrol

After all the trade and DIY activity over the last couple of weeks I had a feeling there would be sharp objects lying around the back yard, like nails and screws hidden in the grass and garden beds!

Al's metal detector - this morning made this like...on the spot. Batteries not required.

The speaker magnet is scewed to the bottom of the plywood disc.

All those little washer like things are pop rivet drill outs from removing the old garden shed roofing

This handful is a quick 5 min sweep, after packing up this evening, between garden shed and gazebo which is only a small area.

This morning I did the other side and ended up with 7 or 8 handfuls - over 100 sharp objects !!!