KR13: "More sentitive to smaller (...) metals". What does that mean?

[U_U]

I am thinking about maybe replacing my etrac with the Multi Kruzer and are looking at the coil options. I wonder what the KR13 can do.
From product description:
"More sentitive to smaller and shallow metals, it also provides convenient use in heavy trash areas."

Use in areas with trash is obvious, but what might "more sentitive" mean, more than what? The stock coil? So this coil will sense smaller items than the stock coil?
Did anyone compare these coils?

Thx.

 

[Tom Slick]

Smaller coils will hit on smaller targets (small nuggets, eyelets, etc). Larger coils are better for larger items at greater depth. The standard 7X11" Kruzer coil is very sensitive to small items and I've dug numerous items like shoe eyelets, so the real advantage to the KR13 coil is really in it's ability to search through the trash infested sites. I currently have, for my Multi Kruzer the 7X11" DD, 5X9.5" DD, 7" concentric, and the 5.5" round DD.