Which of the following is NOT required to be maintained by a firm servicing fire extinguishers?

In the context of servicing fire extinguishers, maintaining fire safety training records is often not mandated by regulations governing the servicing of extinguishers. While it is important for staff to be trained in fire safety and the proper use of extinguishers, the specific requirement to maintain records of that training does not fall under the obligations of the firm responsible for servicing the extinguishers.

On the other hand, various items such as a portable scale, a copy of the insurance code chapter, and seals and tamper indicators are essential for the proper maintenance and servicing of fire extinguishers. A portable scale is necessary to ensure that extinguishers are accurately filled and properly weighed; the insurance code provides guidelines that must be adhered to; and seals and tamper indicators help verify whether an extinguisher has been compromised or if it is still in a state of compliance and readiness for use. Hence, the focus remains on the immediate technical and regulatory components of extinguisher servicing rather than the records of personnel training.