For many years now I have been doing a mod on the Compass Scanner to help you get more depth in the ground and yet keep the units stability. It has worked out very well for many of you, but there is something I should explain. When Compass factory was still in business, I started doing these mods on the vari-filter units. Not long after, Compass created the two filter units with tone ID like the Coin Scanner Pro. The first production or two did not have the mod I was doing in those two filtered units, then the factory changed and installed my mod in the rest of the production. So if you have a two filtered unit in most cases it has already been modified for better depth. Best way i can tell you to test this is to use a copper penny, set the disc on 3 and the power level on preset and if you are getting 8 inchs or more at perset on the penny, then the mod is done to your unit. If you are only getting 5 to 6 inches it has not yet been done. This is done as an air test only. You can use the same test if you purchased a varifilter unit as well to see if the mod has already been done to it. On most that we do the mod to, the unit from the factory is showing 6 inches on power level preset and 8 inches on max power level. When the mod has been done--most units will show an increase to 8 inchs or more on preset and 11 inches or more on max and still will be stable. Only units I have found that this is not true is some of the units made after the factory closed. It seems many of those units vary greatly and calibration can be difficult or none responsive. Those units can be recognized by their deals -- it will have no red color in the decals. Mod cost is $50.00 plus shipping but we clean controls and boards, touch up calibration, and field test before we ship it back to you. If we find other problems or parts needed the cost of repair does go up, but we call first if it is going to exceed $100.00. Hope this helps, Keith
