Air testing is a divisive subject amongst metal detectorists. But, heck, I'm not crazy enough yet to bury this bar in a coin garden. Take it for what it is and I must say, the result was quite a surprise. I had thoerized that it would come in like a penny. Was I wrong! A 5oz 99.99% pure gold bar registers 00 Ferrous, 24 Conductivity (00-24)on the Explorer 2. The tone comes is as sweet and high as a Morgan dollar. Who knew?!?