The tool operates on the principle of mechanical feedback analysis. When tension is applied, the pins bind at the shear line between the plug and the housing, setting the stage for precise measurement.

• Gas, water, and electric meters are often housed in locked boxes. If a field technician does not have the specific key on their ring, a Lishi tool can be used for authorized access. This ensures service continuity for readings or emergency shut-offs.

• The tool transmits clear, real-time tactile information from the lock's pins directly to the user's hand. Simultaneously, the user receives visual confirmation via the moving pointer on the external scale, creating a dual-sensory feedback loop.

• Before handing over a new key, perform one final verification that the person receiving it is the authorized owner or agent. This is the last and most important step in the ethical chain of service.