What measure can significantly enhance the safety of meters used in service applications?

The measure that significantly enhances the safety of meters used in service applications is ensuring they have the proper CAT (Category) ratings and protective features. CAT ratings are part of a system that categorizes electrical equipment based on its capability to withstand electrical surges and over-voltages. Meters with appropriate CAT ratings are designed to handle specific voltage levels safely, which greatly reduces the risk of electrical hazards, such as shock or equipment damage, during service applications.

In addition to CAT ratings, protective features like fuses, circuit breakers, and insulation are crucial for ensuring safe operation. When a meter is equipped with these features, it can help safeguard against potential electrical faults, thus promoting a safer environment for technicians and equipment alike.

Recalibration, high voltage testing, and regular customer feedback, while important in their respective contexts, do not specifically address the inherent safety features necessary for electrical meters in the same manner as proper CAT ratings and protective features.