Certain properties of color centers in diamonds change as a function of temperature. For some technical applications, these properties must be measured at cryogenic temperatures, as this is not possible at room temperature. To address this need, TNO has developed a new optical tool capable of characterizing color centers and related components across various material platforms: the Low Temperature Characterization Setup (LTCS). This state-of-the-art system, operational before the end of 2025, offers a unique capability to characterize NV, SnV, and other color centers at temperatures below 1 K. The LTCS consists of a Bluefors LD-HE250 cryostat, which provides optical access to the sample space, and a control system for manipulating and reading out NV or SnV color centers. The control system features both resonant and off-resonant lasers, optics, and electronics, all managed by a dedicated software framework with ready-to-use measurement routines. Out of the box, the LTCS provides measurement scripts for Photoluminescence Excitation (PLE), Electron Spin Resonance (ESR), and Charge-Resonance (CR) check measurements. The control system is extensible, allowing for the easy implementation of additional measurement scripts for advanced protocols such as T1, T2, and more.