ALTANA Z7-Z10 Bubble Viscometers - Manual (Page 6)

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However, this close tolerance is relatively expensive,
and for the sake of economy, tubes having the
same approximate diameter with a tolerance of
± 0.150 mm. Grade “B” are used by many
manufacturer for general factory control tests.
This viscometer meets the requirements of ASTM
D 154, D 555, D 1131, D 1545, D 1725, FTMS
14la-Method 4271, and AOCS Method Ka6.
Approximate Viscosity in Stokes at 25º C (77º F)
A 0.54
B 0.69
C 0.93
D 1.03
E 1.23
F 1.52
G 1.60
H 2.11
I 2.24
J 2.68
K 2.88
L 3.02
M 3.35
N 3.45
O 3.78
P 4.09
Q 4.42
R 4.67
S 5.18
T 5.47
Directions for Using the Gardner Bubble Viscometer