More and more I find myself switching to standard mode after getting a weak, deep iffy signal in pro mode. Depth and sensitivity in standard mode seems to closely match pro mode, with the added benefit of the full-blown analog signal, plus the bell tone which I dearly love. Those weak pro signals take on a new life, and a lot of the guesswork and different angles of approach and generally diddling around trying to determine if it's a worthwhile target is quickly resolved, and the digital readout is usually the same unless it's a really deep small object. After seven sets of lithium batteries, the ATPro is seeing more use than my 2500, and standard mode is just another tool in the arsenal. HH. Jugg