Installs, maintains, or repairs items or products ordered and supports customers through specialized technical or scientific knowledge/product applications in a customer's home or place of business. Maintains an ongoing relationship with selected customers and sales staff, particularly those focused on technical applications of the product or service. Uses technical knowledge of products, product availability, sales territories, and individual customers to provide a key communications link to the customer. May handle multiple product markets. Typically requires relevant experience, completion of technical product training, and demonstration of high-level product and process knowledge of a technical nature.