Which of the following companies does not belong to the top builders of electric meters?

Honeywell is primarily known for its wide range of products in areas such as aerospace, building technologies, performance materials, and consumer products. While it has some involvement in energy management and metering products, it is not primarily recognized as a top builder of electric meters.

In contrast, companies like Duncan, Westinghouse, and Sangamo have a long history and specialization in manufacturing electric meters and related equipment. Duncan and Sangamo have been significant players in the electric metering space, while Westinghouse is historically known for its contributions to electrical equipment and engineering.

This context helps to clarify why Honeywell, despite its strengths in other sectors, does not align with the specific focus on electric meter manufacturing that characterizes the other options listed.