The Cannon-Fenske Opaque Viscometer measures kinematic viscosity of transparent and opaque Newtonian liquids according to ASTM D445, ISO 3104 and ASTM D2170. Minimum sample volume is 12 mL. Minimum bath depth is 230 mm (9 in). Special constant viscometers are available at additional cost. This is a calibrated viscometer which include a certificate of calibration and instruction sheet. Uncalibrated viscometers are also available.