Thanks Critterhunter, still have to found one non working 10x12 sef to learn what its the beast, but i have one story when I tested my 1050 to the end. it was three month before when some my friends,friend invited me in his secret place where in world war two was military camp and where he hunted last two years. One spot in this former camp around 5x5metres was totally infested in iron and checked by people using different detectors and finding different things. after I spend 5hours in this spot i piked around 30 small buttons -made from two peace,one side iron other fin brass, few very fin around 10mm military signs and more different stuff, it was good, interesting-successful day. I was using my explorer in ferrous without discrimination audio1 coil 1050. Next morning I was in the same spot from early morning with my minelab 8coil, thinking about different small finds what I missed in iron with my 1050, I was disappointed it was few left overs I did nice job with 1050. yesterday i spend three hours testing small fin coin in rusty iron nails; minelab 8 ,small sef and Pro with my loved old 1050 and again i was shocked, best was pro second 1050, not like we all would agree small coils! I was suspected this before but now I am convinced to say GOODBAY MY SMALL COILS. left is all bigger coils,but again need time and coils to understand how its works and what for. Thanks All MerryMerry Stasys