I am making a decision to buy a ABC processor. That opener establishes that you have the power to make a buying decision, and that you seek specific information to do so. It also shows that you have done background research before arriving at the show. If you are just browsing, say so, adds Bancroft. It's not fair to misrepresent yourself to the vendor, who would just give you more information than you could use anyhow.
Many larger booths have a quiet area where serious discussions are held with buyers.
Don't try to conduct the discussion in the main booth area, because the noise level can be distracting. If you need much detail about a new product or service, suggest that you meet with the vendor at a quieter location. Very often, a good choice for business conversation is the coffee bar often set up near the floor. Find out the location of a quiet place like this before you start visiting exhibitors. You may think you can wait until you get back to your room to write down what you have learned.