Wahoo! I have a Brinkman Treasure Sensor 4000, which I'm glad I replaced with an Ace 250. Brinkman makes my barbeque grill as well. Unlike the grill, the detector came w/o instructions when I bought it as a close out item around 1985 or so. I just learned to turn the big knob while holding close to the ground until it stopped beeping and presumed I was ground balancing.
No discrimination; sees everything but does a pretty good job with IDing for size, that is little crackles for shanks of fishhooks to deafening blasts over squashed potted meat cans. I don't know what the deal is around here with potted meat cans; I find one on every outing.
d6