What is being measured by the ruler (ruler A) ? 
Definitions:
Patient's Stool
A sample of feces collected from a patient for medical testing to diagnose conditions affecting the digestive tract, such as infections, malabsorption, or cancer.
Color
The characteristic of visual perception described through hue, saturation, and brightness.
KUB X-ray
A radiographic examination of the Kidneys, Ureters, and Bladder that gives a detailed view of the abdominal area including the structures of the urinary and gastrointestinal systems.
Urinary System
The bodily system consisting of the kidneys, ureters, bladder, and urethra, responsible for removing waste from the blood and excreting urine.
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