From brochure "AR2000 rheometer (TA Instruments)":

"... torque control from 0.0003 
µN.m up to 200 mN.m 
with a resolution of 
0.1nN.m"

"... angular 
velocity control range 
up to 300 rad/s and a 
displacement resolution 
of 40 nrad. The dynamic 
frequency range is 
between 7.5 10^-7 and 628 
rad/s."

See attached file for more information.