Final answer:
Yes, it is acceptable to temporarily leave dial calipers and parallels out during work for easy access, but they should be returned to their storage boxes once the task is completed to prevent damage and maintain accuracy.
Step-by-step explanation:
The question addresses the acceptable practices for handling precision measurement tools in a shop environment. While working on equipment, it is indeed acceptable to temporarily leave dial calipers and parallels out of their storage boxes. However, it is crucial to make sure they are placed in a secure and safe location, away from potential hazards. This practice allows for efficiency and ease of access during work. Nevertheless, once the task is complete, the tools should be cleaned, if necessary, and returned to their storage boxes to protect them from damage and maintain their accuracy.