Similar to Congealing Temperature apparatus described in U.S.Pharmacopeia, 1995, pages 1780, except this apparatus is supplied with Ace-Threds in place of rubber stoppers, where practical. #50 thread at center holds a test tube with a #25 bushing, open top test tube utilizes a rubber stopper to secure a thermometer and wire stirrer, #7 Ace-thred thermometer port on one side, 22mm I.D. opening on the other side to access the 125mm O.D. x 150mm high cylinder. Applicable to substances that melt down between -20 to 150 degree C.