Maybe one of the reasons why you are not seeing some response is most don't have a Sun Ray meter as they have not been made for several years now. Those that have them maybe haven't read the forums yet or haven't responded yet as finding these meters are like trying to find hens teeth. The meter you have is the older bar meter, so anything better is a set up. Sun Ray made these DTI meters back when Minelab only had these bar meters and the DTI were a very hot item as you could see a actual number of the tone you were hearing. This made it much easier to tell what was under the coil. Minelab in 1998 decided to make a DTI meter and used the 550 numbers and many found they didn't like these as well as the Sun Ray DTI meters while some liked them as it was a improvement over what Minelab had before. These first 550 meters used on the XS2 and early XS2a were not as stable and numbers would overlap some from my experience with them. Later on the later 550 meters used on some of the XS2a and the Elite were more stable and a better one, but many still were doing a mod to them to make them 180 meters like Sun Ray had. Sun Ray quit making the DTI meters as many were doing the mods to the Minelab digital meters and Sun Ray was getting into building other items to help out other detectors as the DTIs were not a hot seller as what they had been. Minelab now makes a 180 for the new GT as they seen that is what people liked more and these meters will work on all the Sovereigns from what I understand, but these sit lower and hard to see compared to the Sun Ray meters which is still what many of us like to use, but very hard to find a good used one anymore.
Rick