Is it acceptable to temporarily leave dial calipers and parallels out of their storage boxes while working on the equipment in the shop?

• A. True
• B. False
• C. Sometimes, with supervision
• D. Only during breaks

Answer: (B)

Care and protection of precision measuring tools are essential to ensure accurate work. Dial calipers and parallels are sensitive instruments; keeping them in their boxes helps prevent dust, moisture, or shop debris from getting into the measuring surfaces and prevents accidental damage from drops or knocks. When these tools are left out, even temporarily, there’s a real risk they can lose calibration or become damaged, which can lead to incorrect measurements and poor-quality parts. For that reason, it isn’t acceptable to leave them out of their storage boxes while working in the shop. Return them to their cases when not actively used, and only reuse them after confirming they’re clean and properly calibrated.