I bought a new Seahunter last spring and have problems with holding a steady threshold. One of the forum members said they had the same problem and had to switch to the discrimination mode to keep a steady tone. This seems to work, but I prefer all metal. Those of you who have an infinium, does it have the same problem. I am thinking of selling the Seahunter and trading up. Most hunting will be done in the ocean surf and diving in fresh water