My soil is 50 to 65. I did a test in garden,coins 8 inches down 6 inch apart. 11 inch coil. Set sensitivity to 15 to just get a signal that targets were there. One nickel and one quarter. 0 on g.b. no signal. After g.b., was getting both signals,not great , but a signal i would have not walk by. I always G.B. Every time.