What term describes a test using two or more devices in the same location simultaneously?

The term that accurately describes a test using two or more devices in the same location simultaneously is known as "Concurrent testing." This terminology emphasizes the practice of operating multiple devices or testing methods at the same time in order to gather comparative data or validate results against each other within the same environmental context.

Simultaneous measurement might imply that measurements are taken at the same time but does not specifically emphasize the testing aspect with multiple devices, nor does it clarify the intent behind such testing. Duplicate testing typically refers to using an identical device to obtain the same measurement, which doesn't involve variation in devices or methods. Cross-validation involves assessing the reliability of one method against another, typically within different contexts, and is broader than just concurrent testing at a single site.

Understanding these distinctions is important, especially in radon measurement, where ensuring precision and accuracy is vital, and using multiple devices concurrently can help in verifying results and strengthening the reliability of the measurements obtained.