This poster, entered in the gold medal competition at AGRISHOW 2026, presents a device with two independent climate-controlled chambers (20 oC and 30 oC), enabling for the first time simultaneous comparative testing of the same ensiled material under different temperatures. The solution is protected by utility model No. 39156 and a functional sample. The poster also presents results of a CitroFor study on TMR for beef cattle: at 30 oC, the 4 l/t dose reduced temperature by 1.00 oC, while under barn conditions the optimal dose was 2 l/t; ambient temperature explained 97.2% of temperature variability (ANOVA, p < 0.001).