A Stabinger viscosimeter can measure down to 0.2 cP, if that is sufficient.
They are commercially available, e.g.
http://www.anton-paar.hu/Prospektusok/AP_SVM3000StabingerViscometerAndXsample360_460.pdf
Use capillary viscometer as Ubbelohde viscometer with cell constant less than 0.01.
the optimal flow time for acceptable accuracy must be around 100s or more.
In addition, you may make specific calibration in this region;
Kinematic viscosity = cell constant *(flow time - corrected time). Use standard liquids, you may obtain values of the corrected time for each temperature.
Then you can have very good accurate values which can become one day referenced data and cited in database or in Handbook!
Good continuation.
More, if the temperature is an import parameter, you can can make your room in a temperature very near of the measured one by the air-conditioner. Wait more time for stabilization and equilibrium. Then, you eliminate the temperature gradient, and you obtain apparatus working in very optimal conditions, you will have very sure values and well-night equivalent to those obtained by very expensive sophisticated materials.
There are many tricks for modest conditions! Good wishes.
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