The Barnant GV-2100 falling ball viscometer includes two size #1 balls of different densities for measurement of the dynamic viscosity of transparent Newtonian fluids. It uses a glass ball for the 0.2 to 2.0 centipoise (cP) range and a 316 stainless steel ball for the 1.0 to 10cP range. An optional tantalum ball (sold separately) measures the 2.0 to 20cP range. The viscometer uses a 7mL sample size and the closed system allows testing highly evaporative and hydroscopically deteriorative solutions. It has wetted materials of glass, Viton, and Delrin acetal for corrosion resistance. This falling ball viscometer is suitable for testing a variety of fluids used in laboratories, research and development, process control, and plant quality control applications.

A viscometer, also called a viscosimeter, is an instrument used to measure the friction caused by the relative motion of a Newtonian fluid and a known surface, and is usually expressed in units of poise (P), centipoise (cP), pascal seconds (Pa s), and millipascal seconds (mPa s). Viscometers have several forms, including but not limited to falling ball, rotational, vibrating, capillary, funnel, and bubble. A falling ball viscometer measures the time it takes for a ball of known diameter and density to fall through fluid in a cylinder of known diameter. A rotational viscometer measures the force required to stir a fluid. A vibrating viscometer measures the power input necessary to keep the oscillator vibrating at constant amplitude while immersed in a fluid. A capillary viscometer has a narrow-bore vertical section with two printed marks that measure time required for a known volume of fluid to fall a known distance. A funnel viscometer, such as a Ford, Zahn, or Shell cup, measures the time it takes a known volume of fluid to flow from the base of a cone through a short tube. A bubble viscometer measures the time required for an air bubble to rise through a fluid. Viscosity measurements are used in laboratories, research and development, process control, and plant quality control applications. Some viscometers are manufactured to meet industry or governmental standards, including Ingress Protection (IP), National Institute of Standards and Technology (NIST), International Standards Organization (ISO), and ASTM International (formerly American Society for Testing and Materials)

Thermo Fisher Scientific manufactures analytical instruments, laboratory equipment, consumables, and software under the Thermo Scientific, Fisher Scientific, Barnstead, Nalgene, and Orion brands, among others. The company is headquartered in Waltham, MA.