Most rebar locators have very easy to understand screens. There should be an indicator for when you are moving towards or away from the metal there will be a plus or minus sign. There should also be a depth indicator telling you how deep down the metal is. That is the basics, you when you find the points where the plus turns to minus in two directions go up and down making sure the depth is consistent this will tell you if its rebar or just scrap metal.
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