What is a disadvantage of using a gold cup electrode?

The choice that identifies increased cost as a disadvantage of using a gold cup electrode is correct due to the material and manufacturing processes involved in producing electrodes of this type. Gold is a precious metal, and its use in electrodes typically results in a higher purchase price compared to electrodes made from more common materials. This increased cost can be a significant factor for facilities that require a large number of electrodes or have budget constraints, making gold cup electrodes less practical in those situations despite their advantages in terms of conductivity and reduced noise levels in signal acquisition.

In contrast, while it may be true that gold cup electrodes are difficult to break and typically exhibit low impedances, these characteristics are actually considered benefits in many applications. Additionally, the requirement for disposable electrodes does not inherently apply to gold cup electrodes, as they can often be reused with appropriate cleaning and maintenance, further solidifying their use in certain settings despite the initial investment.