Manual Glass Viscometers

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Manual Glass Viscometers
CANNON Instrument Company® has been making glass capillary viscometers since 1938. We offer a variety of glass capillary viscometers because no single viscometer is ideally suited to every application. Use of high quality instruments ensures test reliability and accuracy. All CANNON glass capillary viscometers are traceable to a NIST calibration and manufactured in our ISO 9001-registered, A2LA-accredited laboratory. Our experienced staff is happy to assist you with viscometer selection. We offer the following viscometer types:

For transparent/translucent liquids

Suspended Level
For transparent/translucent liquids. Ideal for testing at multiple temperatures because they have the same viscometer constant at all temperatures.

For dilution of polymer solutions to provide an estimate of the molecular size and shape.

Reverse Flow
For transparent and opaque liquids. Must be cleaned, dried and refilled between repeat determinations.

A special type of reverse-flow viscometer for highly viscous samples (transparent or opaque). Accurately controlled vacuum is required to pull the liquid through the viscometer.

CANNON's testing laboratory is ISO 9001:2015 certified through Underwriters Laboratories.
We are ISO 9001 registered for the following products and services:

We are ISO 9001 registered for the following products and services:

  • 3823 (US): Industrial Instruments for Measurement, Display, and Control of Process Variable; and Related Products.
  • The manufacture and certification of viscosity standards and the viscosity certification of customer-supplied materials.
  • The provision of calibration services for viscometer and kinematic viscosity thermometers.

Click here to view a copy of our ISO 9001 certificate.

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CANNON Instrument Company
CANNON Instrument Company has earned international acclaim for the quality of its viscosity-related products and services since its founding in 1938 by scientist, inventor, and educator Dr. Michael R. Cannon. The company's longstanding emphasis on production of premier-quality test equipment has kept CANNON at the cutting-edge of research and development.


  • Automated Viscometers & Rheometers
  • Viscosity & Flash Point Standards
  • Constant Temperature Baths
  • Manual Glass Viscometers
  • Physical Property Testers
  • Service & Support
  • Densitometers
  • Digital Thermometers