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Heat aging testing of rubber in liquids and air This tube furnace has four compartments for simultaneous testing in different temperatures. Capacity, 6 test tubes per cell. High Temperature Accuracy Temperature range: + 40 °C to + 200 °C (EB 11) + 40 °C to + 300 °C (EB 11HT) A few features: Testing in liquids and air. Temperature stability in time and space, ± 0.25 °C Temperature control by sensor in test tube Temperature control accuracy, 0.1 °C Display in case of power failure.