Additive manufacturing (AM), in particular laser powder bed fusion (L-PBF), enables the fabrication of more complex geometries compared to traditional manufacturing methods, such as casting or milling. This is beneficial in the development of cooling channels in high-temperature components of gas turbines (GT), as the thermal efficiency can be enhanced. A consequence of this manufacturing process is a high surface roughness (SR) influencing both pressure loss and heat transfer (HT). To gain a better understanding of forced convective HT on surfaces with AM-induced SR, the Surface-Roughness-Heat-Transfer (SRHT) has been built and employed in the Fluid Dynamics Laboratory of Siemens Energy AB.