Gloss is a physical quantity that evaluates the ability of a material surface to reflect light under a set of geometrically defined conditions, and it has a direction-selective reflective property.

Reflected image sharpness refers to the degree of clarity of details and boundaries in an image after reflection.

When the stylus lightly glides across the surface of the workpiece being measured, the stylus will move up and down in a direction perpendicular to the surface contour due to the undulations of the surface contour. This movement is amplified by an electronic device, and then the relevant roughness data or graphics are output through a zero indicator or other output device.

This instrument is manufactured using modern processes and features an advanced dedicated CMOS digital camera, a high-resolution zoom microscope, and a high-brightness LED backlight system. It is equipped with a three-dimensional sample stage, allowing for vertical, horizontal, and forward/backward movement. This enables micro-sample injection and precise vertical and horizontal movement.

Transmittance: The ratio of the radiant energy projected onto and transmitted through an object to the total radiant energy projected onto the object during the process of incident light flux from the incident surface to the other side is called the transmittance of that object.

Haze meter: Primarily used to measure the optical properties of glass.

The phenomenon that hinders the relative motion between the tester and the glass is called "kinetic friction".