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Distillate Fuel Oil Oxidation Stability Tester LB-10DOS | Labotronics Labotronics distillate fuel oil oxidation stability tester is a digital distilator integrated with 4 stainless steel tubes that carry oil fuel samples and test their stability. A water jacket inside the chamber evenly distributes the heat, and a PID controller maintains sample tubes at a predefined temperature. It continuously monitors the volume of fuel samples and oxygen flow and performs the required adjustments automatically to maintain the specified level, ensure a reliable and accurate process of distillation.