About as small as ive found with the multi freq is .3 grams. But its not weight but sensitivity .... dang chain could be a whopper but add a little depth and it looking at ONE link and its GOOOONE. Lot of work for the most part like you said digging everything, but some make it pay off a PI is used right. Takes a lot of those backs to buy a Mickey Ds happy meal.... unless its one of those surprise HONKER chains.... then its a real HAPPY meal.
Dew