I often work in a development where the developer used 3 to 4 pieces of rebar for anchoring in every oak, elm, maple, and river birch installed. For safety and financial reasons I'd like to check for rebar in these tree stumps before bringing my grinder in. Sometimes the customer or a previous owner has removed the rebar. Does anyone have any recommendations or not recommendations? I was looking at a basic model like a Garrett Ace 200 or 300. Rebar is typically 1/2" and 3 to 4 feet long. Getting that unwrapped from a grinder is no fun.