I see. So essentially something like: call and set up appointment saying something like "we've been working on a tool for your industry and we would like to share it with you and get your thoughts and suggestions"?
Yes, be transparent about who you are. Try to make a friend out of your target user, learn about them. As part of the feedback loop, you may even ask-- what do you think a app/tool like this should cost? Early adopters/promoters who provide good feedback could earn a discount. Book suggestion: Gitomer's "Little Red Book of Selling"-- basic premise "people don't like to be sold, but they love to buy."