👉 A densitometer is a device that measures the density of an object. It uses a specific type of light source, such as a helium-neon laser or an x-ray tube, to bounce and scatter the light in different directions. When the light hits an object, it reflects off the surface and returns to the detector. The densitometer then counts the number of reflections and calculates the density of the object. The term "densitometers" is a widely used technical term that refers