Live demos take time. And as a salesperson, your time is money. Besides, the average customer will only remember a small percentage of what you said once your demo is over. 

A better approach may be to lend out your demo unit to a different shop every week. Once a customer experiences the tool in his or her shop on a day-to-day basis, he or she will more likely see the benefits. Just be sure to provide the manufacturer's support number to address any questions.