Description
Fisher Scientific Model 20 Surface Tensiometer Allows upward & downward measurement of tension Dual scale is graduated from 0 to 90 dynes/cm in clockwise and counter-clockwise direction Torsion to raise ring and simultaneously lower table is applied manually Eliminates parallaz errors by aligning index needle on lever arm with line on mirror Performs ASTM D 971-99a (oil-water interfacial tension procedures) & D 1331-89 (methods for measuring surface and interfacial tension for detergents) Employs Nouy ring method for direct results w/ no calculations Accuracy equals data from capillary-height or drop-weight measurements to within 0.25%
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