Comment by tritipsocial

Let's do the math for a raspberry pi sized board:

Dimensions: 85 mm x 56 mm

Area: 4760 mm^2 or 7.38 in^2

Copper: 4 x 1oz layers

Copper Weight: 0.205 oz = 0.013lb

Copper price: 0.013 * $4.50/lb = $0.0585

And that doesn't include the copper removed by etching. So if they paid a 6c tariff on each raspberry pi board, they'd be overpaying.

Can they generate a certificate claiming each board contains no more than this amount of copper, overpay the tariff by a few pennies, and carry on?