What is a requirement for the wall-mounted stadiometer?

The requirement for a wall-mounted stadiometer to be permanently installed is essential for ensuring accuracy and reliability in measuring height. A permanent installation helps to maintain the stadiometer's position, preventing it from shifting or moving over time, which could lead to inconsistent readings. Stability is crucial because height measurements can be influenced by slight adjustments in the equipment's alignment. While other factors like being digital or adjustable might have their advantages, a permanent installation is fundamental for achieving precise and repeatable height measurements in any setting.