RheoSense

microVISC™ is a compact, battery-powered viscometer designed for routine viscosity testing. With intuitive operation and setup in under a minute, it delivers accurate and repeatable measurements using as little as 100 microliters of sample. Powered by RheoSense's patented VROC® technology, it offers lab-quality results in a portable format.

Ideal for both laboratory and field use, microVISC™ is trusted by leading companies worldwide for fast, easy, and precise viscosity measurements—saving time and reducing sample waste.

Key Features

• Easy to operate
• Requires only small sample volumes
• Rapid measurements in under one minute
• Accuracy within 2% of reading (across wide viscosity ranges)
• Repeatability within 0.5% of reading
• High resolution: 0.001 mPa·s
• Portable — weighs only 1.6 lb

Understanding Fluid Behavior — Measuring Absolute Viscosity

RheoSense’s VROC® technology integrates the core principles of rheometry with microfluidics and MEMS (micro-electromechanical systems) manufacturing to create a compact viscometer capable of precise measurements using micro-scale samples. This innovative platform surpasses the limitations of conventional viscometers in sample volume, measurement range, and precision.

Scientific Principle

The core measuring element is a rectangular slit flow channel made of borosilicate glass with a constant cross-sectional area. As the sample flows through at a steady rate, embedded pressure sensors detect the pressure drop from inlet to outlet. This pressure drop corresponds to the shear stress at the channel walls. Combined with known geometry and flow rate, the system calculates shear rate and shear stress, enabling accurate viscosity measurement.

• Compliant with United States Pharmacopeia (USP) standards.

VROC® initium is an advanced, fully automated viscometer that delivers true viscosity measurements with exceptional accuracy and repeatability. Its high resolution enables analysis of hydrodynamic size, particle-particle interactions, and protein stability.

Key Features

• The first automatic, high-throughput viscometer
• Requires as little as 26 μL of sample
• Shear rate and temperature sweep capabilities
• Supports sample recovery
• Compatible with 96-well plates and 40-vial racks
• Viscosity measurement range: 0.5–1,000 mPa·s
• Temperature range: 4–70 °C
• User-friendly operation

Microfluidic devices provide precise control of fluid flow while minimizing the sample volume required—typically around 1.5 µL. They also support high-throughput measurements and versatile operation, helping reduce testing costs.

MEMS devices integrate mechanical components, sensors, actuators, and electronics on a silicon substrate using microfabrication techniques. This enables ultra-precise functionality at a microscale.

By combining microfluidics with MEMS technology, RheoSense has redefined viscometry. The result is compact, intelligent, and fast viscometers capable of measuring fluid viscosity across a wide range of conditions. VROC® technology delivers performance far beyond the capabilities of conventional viscometers.

• Compliant with United States Pharmacopeia (USP) standards.

m-VROC™ is a high-performance, automated viscometer designed for small sample volumes. Trusted by Fortune Global 500 companies and top research institutions, it supports demanding applications such as protein therapeutic analysis. With as little as 20 µL of sample, it delivers accurate, repeatable viscosity measurements across an exceptionally wide shear rate range—up to 1,400,000 s⁻¹.

Key Features

• Accuracy: ±2% of reading
• Repeatability: ±0.5% of reading
• Viscosity range: 0.2 to 100,000 mPa·s (cP)
• Shear rate range: 0.5 to 1,400,000 s⁻¹
• Sample volume: as low as 20 µL
• Dimensions: 10" × 15.5" × 7"

• Supports controlled shear rates with minimal sample volume requirements.

• Compliant with United States Pharmacopeia (USP) standards.