We provide bidirectional reflectance measurements for lidar simulation and validation. Our reflectivity measurement device (RMD) covers wavelengths between 905 nm and 1550 nm. The individual sender and receiver arms are controlled individually to freely configure incident and exit angles. The portable size of the RMD allows for measurements of samples in out lab or on-site ground measurements. On-site measurements for example facilitate the generation of digital twins of proving grounds.