Final answer:
The Bod Pod is accurately calibrated using a cylinder with a known volume, which is true. This ensures precise measurements for body composition tests.
Step-by-step explanation:
The Bod Pod device is often calibrated using objects with a known volume. When using a cylinder with a known volume, the Bod Pod can be accurately calibrated to ensure precise measurements of body volume. Therefore, the statement that the Bod Pod is calibrated using a cylinder with a known volume is true. Such a process is critical in body composition tests to measure accurately the density and volume of the human body, which can offer valuable insights into a person's health.