Cannon®-Manning Vacuum Viscosity Tubes are for measurement of viscosity of highly viscous materials such as asphalt cement at 60°C (140°F) according to ASTM D 2171. Applicable to materials with viscosity range of 0.036 to 80 000 poise. Vacuum of 300 mm Hg is applied to small arm with timing bulbs; two bulbs are incorporated to extend viscosity range of viscometer. Provided with certificate of calibration. Minimum sample volume 6 mL. Require liquid bath depth of 180 mm (7.1").