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device used to measure the distance between two opposite sides of an object
Peter Attia MD
An older method for measuring body composition, noted as being subjective and highly dependent on the skill of the operator.
![Peter’s historical changes in body composition & evolving nutrition & training [AMA 44 sneak peek]](https://i.ytimg.com/vi/m6Smu2SlIKk/maxresdefault.jpg)