What we make

Glass capillary viscometers, viscometer baths, viscosity reference standards & automated viscometers. We manufacture, calibrate and supply the full range of apparatus for capillary viscometry. Kinematic viscosity and dilute solution viscosity is what we do. Deal direct with the capillary viscosity experts. Browse our extensive range of viscometers and accessories here.


Calibrated glass viscometer in constant temperature viscometer bath


Constant Temperature viscometer bath


Certified viscosity standard for kinematic viscosity


Automated viscometer for kinematic viscosity


No standard test method for your samples? We will customise our instrument to match your needs

We work with customers to provide a solution to their measurement requirement. Proprietary test protocols accommodated. We routinely work with major commodities manufacturers on their certification regime. Experience and dedication go hand in hand in our small specialist team. Our capillary viscosity experts are available to assist you.

Dilute solution viscosity sample preparation


When you need to know if you measure correctly

Unsure about your viscosity results? Run a reference standard to confirm the numbers. At PSL Rheotek, we offer a wide range of viscosity standards for ongoing verification and calibration. All standards are supplied with certified data. . Kinematic and dynamic values included with all standards. Come direct to the capillary viscosity experts to get the numbers right

Certified viscosity standard for kinematic viscosity


No matter what … we got your back

Each sale of an automated viscometer system is the beginning of a relationship. Ongoing service support for your PSL Rheotek RPV Polymer Viscometer is available from our technical service team or from the dedicated dealer in your region. At PSL Rheotek, we do our best to keep all our customers operational no matter how old the unit is. As viscosity experts, our priority is to keep you going.

Customer Service with a smile


Measuring IV, K-Value & RV since the late 1990’s

The PSL-Rheotek RPV Polymer Viscometer is a household name in the polymer industry. It was introduced in response to an industry demand for automation of capillary viscometry in the 1990’s. The PSL Rheotek RPV Polymer Viscometer offered clients the confidence of well proven protocols and the convenience of automation. All test work is always carried out as detailed in international standards. Benefits include limiting operator exposure to chemicals and an improvement in repeatability. The PSL Rheotek Polymer Viscometer is used by leading manufacturers of virgin resin around the world. As experts in capillary viscosity, we do our best to continue to deserve their trust. In recent years, we have entered the next link in the polymer value chain, supplying our technology to compounders, extruders and recyclers.

Customer focused

Make the impossible possible

Never give up


years of history


automated viscometers sold


satisfied clients


countries served

Master Viscometers are much longer than normal viscometers and require extra care and a patient mindset to calibrate them. Laboratory Technician from our calibration laboratory can testify to that.

Patience is the name of the game for 

– Liam Cooper