PSL Rheotek is a UK manufacturer of high quality glass capillary viscometers and a range of automatic viscometer systems. PSL Rheotek specialises in measuring the viscosity of petroleum products, polymers & pulp in compliance with international test methods. Product specification testing of oil products and polymers is the backbone of the business. The company is family owned and operates from premises in the market town of Burnham-on-Crouch in Essex. Viscometers and reference materials from PSL Rheotek are used by industry laboratories all over the world. All automated instruments are developed and manufactured in-house by a dedicated team of specialists.