But unless these test gardens have lots of trash buried especially different types of pull tads, caps ,screw caps and can slaw only depth is shown and one of the most important factors are missing. People are standing in line to buy these half tested wonder machines.. Parks I search in my area have millions of these targets that will trip these detectors up, good luck with a efficient hunt by the time a small portion is covered very well the season will be over. The Sovereign's strong point most bottle caps, pull tabs and even screw tabs don't even cause this detector to hiccup. Yes there is a constant learning curve with this hobby and a coin & thrash garden can help. Look for the strong and weak points of a detector, yes depth is very important but being able to wade through the litter to find a good target is the only way for a successful hunt.