With square nails they I’m not seeing a huge difference. To get the same result the FE at 0 and F2 at 4. This is with silver directly under the nail. I am able to hear a mid tone with a VDI of 17. Same VDI for a dime and a quarter. Now I’m thinking I should adjust my tone break to 17 and above for silver targets in iron. Dig a little more.