Viscosity Baths & Viscometers
RIGO's viscosity range covers fully automatic VMR and VMC measuring systems, the 403/404/405 precision constant-temperature baths that hold ±0.01 °C, dedicated Ubbelohde and Cannon-Fenske viscometers, automatic cleaning stations and digital timing.

Overview
Kinematic viscosity is the single most frequently measured property of fuels and lubricants, and the measurement is only as good as the bath holding the sample. RIGO has built viscosity measuring systems for more than forty years, and its PID temperature control holds stability within ±0.01 °C below 100 °C and ±0.03 °C from 100 °C to 180 °C. The range runs from dedicated glass viscometers and the 403/404/405 baths through to the VMC holder-type systems and the fully automatic VMR series, which samples, thermostats, measures and washes without operator intervention. Measurements follow JIS K2283, ASTM D445/D446 and ISO 3104/3105, with selectable calculation formulae for kinematic, relative, intrinsic and inherent viscosity.
Manufacturer: Rigo — Japan
Local sales, installation, and technical support in Bangladesh by trained local engineers.
Models

Precision Kinematic Viscosity Bath: 403/404/405 Series
Precision constant-temperature baths for kinematic viscosity, holding ±0.01 °C below 100 °C to JIS K2283 and ASTM D445.

Apparent Viscosity Test Apparatus: RAV-101 / RAV-101M
Apparent viscosity apparatus for lubricating greases to JIS K2220 and ASTM D1092, with a low-temperature RAV-101M variant.

Automatic Viscometer Cleaner: RVC-06C / RVC-06U
Automatic washing and drying unit for capillary viscometers, used mainly with petroleum product samples.

Automatic Viscosity Tester: VMC-5 Series (VMC-522 / VMC-523 / VMC-552 / VMC-553)
Holder-type automatic viscometer systems in medium- and high-temperature variants, accepting Ubbelohde, Cannon-Fenske and Cannon-Ubbelohde tubes.

VMC Dedicated Viscometers: 410-UA / 410-CA / 410-CRA
Dedicated glass capillary viscometers — Ubbelohde, Cannon-Fenske and Cannon-Ubbelohde — made for RIGO's VMC automatic systems.

Fully Automatic Viscometer System: VMR-022UC (2-Position, Desktop Type)
The VMR-022UC is a desktop, two-position fully automatic viscometer system designed for medium-temperature kinematic viscosity testing.

Fully Automatic Viscometer System: VMR-052UPC Series (5-Position)
Five-position fully automatic viscometer system that samples, thermostats, measures and washes without operator intervention.

Digital Stopwatch for Kinematic Viscosity Measurement: WDS-202-3
Digital stopwatch for kinematic viscosity, giving traceable manual timing alongside the 403/404/405 baths.
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