Final answer:
It is false that all Set Top Boxes can be used as a test tool; they are mainly for receiving and decoding TV broadcasts. Some may offer limited testing features, but they're not general-purpose test tools.
Step-by-step explanation:
The statement that all Set Top Boxes can be used as a test tool is false. Set Top Boxes are primarily designed to receive and decode digital television broadcasts. While some Set Top Boxes may have additional features that could be used for certain types of testing, such as signal strength or quality, they are not universally designed as a general-purpose test tool. Professional test tools often have precise and specialized functionalities that far exceed the capabilities of standard Set Top Boxes. Therefore, not all Set Top Boxes are suitable for use as a test tool, and their use is limited to the features and functions they were originally designed for.