The digital solar spectrum transmission meter offers three distinct measurement modes to accurately assess key transmission parameters: Visible Light Transmittance, UV Transmittance, and Infrared Transmittance at both 940 nm and 1400 nm wavelengths, as well as full-scale IR transmittance. Additionally, it enables the evaluation of the Total Solar Energy Rejection (TSER) and the Solar Heat Gain Coefficient (SHGC). This comprehensive functionality allows for a thorough evaluation of the optical performance of window films, glass, and glazing systems, ensuring precise and reliable results.