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What does the Group 2M UL rating signify for a mechanical combination lock?

  1. Able to withstand 20 man-hours of expert manipulation

  2. Able to withstand reasonable expert manipulation

  3. Able to withstand 2 man-hours of expert manipulation

  4. Able to withstand expert manipulation with X-Ray resistance

The correct answer is: Able to withstand 2 man-hours of expert manipulation

The Group 2M UL rating for a mechanical combination lock signifies that the lock is able to withstand 2 man-hours of expert manipulation. This rating is part of Underwriters Laboratories (UL) testing standards that categorize locks based on their resistance to various forms of unauthorized access, particularly by skilled individuals. A 2M rating indicates that if a professional locksmith were to attempt to bypass the lock, they would need 2 hours of time to successfully do so. This level of security is significant because it provides a baseline reassurance to consumers regarding the effectiveness of the lock in protecting against unauthorized access. The precise duration specified by the Group 2M rating reflects a balance between durability and practicality for everyday use, making it suitable for environments needing a higher security level without excessive complication in usage or installation.