Final answer:
Product testing is related to the 'routine production services' skill, requiring detail-orientation, strong organization skills, and effective time management.
Step-by-step explanation:
The skill involved in testing products is most closely related to Robert Reich's marketable skill of 'routine production services' which mainly involves the organization and detailed nature of product testing.
This would encompass the need for knowledge in mechanical and physical testing procedures, the execution of field-testing during product development for real-world feedback and making decisions based on precise data collection and research. To be successful in product testing, a worker needs to be detail-oriented, possess strong organization skills, and be capable of managing time effectively to meet deadlines.