Viscometer (10) with fluid holder (12) rotatable by a motor (M) and gearing (50) to shear a tested fluid (F) thus imparting torque to a spindle assembly (32) mounted via a flexural mount (rods R) and having a read-out rod or wire (40) with an adjacent transducer (R, S), the wire passing through an elongated holder shaft (18) within a fixed cylinder that mounts an elongated fluid holder extension (16) via an elongated bearing array (20, 22, 24) on the outer surface thereof. The instrument is pressurized. The region of measuring fluid effect on the viscosity read-out is substantially confined to fluid in the pre-selected measuring zone (A to B).
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