Cannon Instrument 9721-B74 Model CFRC-400 Size 400 Cannon-Fenske Routine Viscometer, Calibrated. The Cannon-Fenske Routine Viscometer measures kinematic viscosity of transparent Newtonian liquids according to ASTM D445 and ISO 3104. Minimum sample volume is 7mL. Minimum bath depth is 203 mm (8 in). This viscometer includes a certificate of calibration and instruction sheet. Holders are sold separately.