Strobe,not all Blue Minelab meters are calibrated to 180.I have used both the 180 and 550 for me the 180 is more stable and a lot easier for me to use.No matter which 180 meter you find they demand a higher price.There is a kit for a 550 meter to recalibrate if you're on a budget.I have seen some of the blue 550 meters go for around a hundred bucks.The last 550 meter I got was one on Ebay for 50 dollars a couple of seasons ago.By the way I did use a 180 meter that was converted from the old black meter and it had no ID depth so watch out for some of these do it yourself job projects.I used a Nighthawk Winburn 180 similar to the Sunray for a couple of seasons and have nothing but praise for this meter.I sold my Sovereign equipment and just put another unit together with the add ons and had one heck of a time finding a 180 meter.At this point I have a early model Avenger Winburn which because of the weather hasn't seen any field use but with a run through the coin garden and air seems fine,but the meter cover has to be removed to make any adjustments.For park hunting the meter is probably your most important accessory to add on your Sovereign.By the way you see one for sell act quick they sell fast. Good luck