How can you determine if a Type B extinguisher has been used?

To determine if a Type B extinguisher has been used, examining the weight or safety seal is a reliable method. When a Type B extinguisher is discharged, the contents are released, which will significantly reduce the weight of the extinguisher. If the extinguisher feels lighter than its rated weight, it indicates that some or all of the extinguishing agent has been used. Additionally, the safety seal serves as a visual indicator that can show whether the extinguisher has been tampered with or discharged.

This approach is particularly effective because it provides a straightforward and tangible way to assess the status of the extinguisher without requiring intricate inspections or tests. It ensures that the extinguisher is still in a functional state before any potential emergencies arise.