A lot has been said about not trusting your TID meters on most machines and to trust your ears when deciding what to dig or not to dig. While this is of course very good advice, especially on other brand machines, I am totally convinced that the SR meter
is as accurate as any that can be had at this time. Sometimes the meter can tell you
when to dig when your ears tell you not to. For example, as anyone using the meter already knows, it will read the common trash items almost always the same at the same site, (crumpled up pull tabs being the exception) But for most complete trash targets they will read within a digit or two on the meter. So say your hunting a trashy park or lawn. You are getting solid 168 readings on round tabs, 172's on square tabs. 155's on bottle caps, (always dig a few of the repeating readings just to see where they are reading at the site your hunting). All of a sudden you get a lonely Solid 160 reading, while it sounds very close to the pull tab signals, its out of place and could very well be a ring or other good target. I love those odd readings they are almost always a good target provided they give a solid response. I particularly pay attention to solid low readings, twice a solid low 130's signal turned out to be gold, 160 was a copper nickel indian head and 166 was a silver 3 cent piece. So not only would these objects be left if not using the meter, they wouldn't even be heard if notching out or discriminating pull tabs and foil.  So
in closing, this is the SR/Sovereign advantage. It allows you to hunt with no disc, no notch, and use the combination of both your ears and the meter's abilities even in the most trashy sites. I am sure some rings will read exactly the same as some of the trash targets, but by applying this method, you should still get most of them while limiting your digging of garbage to the minimum. One more thing, the Sunray meter is the only one on the market today that is fully adjustable to your coil. Every coil must be tuned to the detector, with the sunray's adjustment knob you can tune your meter to what ever coil you are using, unlike other detectors which if  you switch coils the meter will be out of adjustment.