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Lab Expo Engler Viscometer units are used for determination of viscosity of petroleum products and bituminous materials under controlled thermal conditions. The range includes 100 ml and 200 ml graduated flask configurations, with standard water flow time of 51 ± 1 s and operating temperatures from 0 to 100 °C. Select models support dual-volume measurement for bituminous samples, enabling comparative flow behavior analysis in fuel testing, asphalt evaluation, and viscosity-based quality control workflows.