Off the shelf means that it is ready made for purchase and not custom built, and the context is saying that the precision offered is better than what is off the shelf aka readily available for purchase.
Consider the statement "We use our own custom software, so we can offer much more precision than what you can find in stores or commercially available.' , the CEO exclaimed”". Based on this "We use our own custom software, so we can offer much more precision than what you can find off the shelf.' , the CEO exclaimed”" a true statement? Yes, no, or I don't know?