Which range best describes the typical accuracy of a viscosimeter?

• A. 85%-90%
• B. 90%-95%
• C. 95%-99%
• D. 99%-100%

Answer: (C)

When we talk about accuracy for a viscosimeter, we mean how close the measured viscosity is to the true value, assuming the instrument is properly calibrated and used under controlled conditions. In typical lab use, a high-quality viscosimeter reports values very close to the true viscosity, usually within about 1% to 5% of the correct value. That level of closeness corresponds to the 95%–99% accuracy range. It reflects reliable performance while acknowledging small unavoidable errors from factors like temperature stability, sample handling, and instrument tolerances. The ranges lower than that would imply larger deviations than what is commonly observed, and the 99%–100% range would imply near-perfect accuracy that isn’t realistic in practice.