Using the Fraunhofer diffraction principle, it achieves precise outer diameter measurement of ultra-fine wires. This method ensures high accuracy even for extremely small diameter wires, making it ideal for micro-wires, and other fine materials.

The LIG series devices use the Fresnel diffraction principle with a multi-spectral parallel laser light source, which effectively reduces ambient light interference, improving measurement stability and precision. This makes them particularly suitable for complex industrial environments.