Like i put in a previous post i have only had my t2 se for a week now and it has been giving id numbers in the 70s for old square nails so now im wondering about depth. I did an air test yesterday with sensitivity at 90,discriminatin at 10,2+ tone and with a steady id numer and good audio tone: flat button @ 7 inches,.58 minie @ 71/2,spur buckle @ 7 1/2 inches.....same settings and erratic id numbers/barley picking up audio signal i got about 1 1/2 inches added to those measurements on each item........dropped sensitivity to 80 and it took away 1 1 /2 inches on each item. My question is,are these measurements about normal for the t2 se? I just thought id get a couple inches more depth but if thats the way it is then ill live with it. I ask these questions just to make sure i didnt get a defective machine. Thanks in adavance for any input