The CANNON CAV 4.1 is a fully-automated, single bath, benchtop kinematic viscometer with two 14-position sample handlers for unattended ASTM D445/446 testing. Each of the two Ubbelohde-style tubes covers a 100-fold viscosity range at values between 0.5 mm2/s (cSt) and 10,000 mm2/s (cSt) from 40 °C to 150 °C (down to 20 °C requires TE cooling option). Automated vial washing and drying enables reuse, and reduces consumable costs. VISCPRO Windows® 10 software application permits one controlling computer for up to four instruments, and enables programming of of user-defined test methods. Automation increases precision. Easily removable dual 14-position sample trays allows high throughput of 28 samples per hour.