What tool is used to measure strength?

The dynamometer is specifically designed to measure strength, capturing the maximum force exerted by an individual, typically in a controlled manner. It can be utilized for various strength assessments, including gripping strength or muscle strength in different body segments. The device provides quantitative data that can help assess an individual's strength levels and progress over time.

In contrast, while a barbell is often used for strength training and resistance exercises, it does not provide a measurement of strength itself; rather, it serves as a tool to develop strength. Calipers are instruments primarily used for measuring body fat percentage or skinfold thickness, not strength. A ruler is primarily used for measuring length or distance and does not measure strength at all. Each of these tools serves a distinct purpose, but only the dynamometer is intended for the measurement of strength.