Thermic Bottles 8pcs

Thermic sense is refined through exercises of pairing and grading. The bottles are chrome-plated copper for conductivity and are identical in appearance to prevent visual matching. The set includes a wooden box with two compartments that holds 8 bottles with screw-on tops.

Fill the thermic bottles with water of different temperatures; two quite hot, two warm, two tepid and two cold. Can you match the pairs?