The best two tools would be a (1) a current list of "benefits-features" that differentiate your product and give the salesperson the information to create "value propositions" specific to the customer and individual customer personnel, and (2) endorsements in the form of references and testimonials.
In some markets like, Taiwan, Japan, Korea and China endorsements are essentials. But even in other markets they are crucial, particularly in the semiconductor industry, where equipment and non-commodity materials decisions are often made on a "bet-your-job" basis. A bad decision could cost the company many millions and a good one can suddenly make the decision maker a hero.