Strange the pro wont pick that up isnt it??I have the vibra probe. (doesnt go very deep)Im really hooked on the sunray probe tho myself.I love being able to use the detectors settings to probe my holes(which are full of iron most of the time).This way I get what im after instead of digging all the iron up.I recently had to send my sunray back,The field was broke and ity was going nuts.Anyways I started using the vibra probe as my backup...I started having to give up on some holes because i couldnt find the target.I think the depth ability was my main issue.I get about 3 to 4 inches with my sunray on auto sens. Good Luck on your choice!! HH