Rudolph Research Analytical has been a global manufacturer and supplier of  precision, automatic, laboratory instruments for over 50 years.  Rudolph Research Analytical manufactures automatic, digital, bench-top Refractometers, Polarimeters, Saccharimeters, and Density Meters for a wide variety of industries.

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DDM 2909 Automatic Density Meter

DDM 2909 Automatic Density Meter

DDM 2909 Automatic Density Meter

Density Meter

The Rudolph DDM 2909 Automatic Density Meter features built-in Peltier Temperature Control of the Sample, Full Range Viscosity Correction, Reference Oscillator and VideoViewTM  for easy bubble detection, and is fully GMP/GLP Compliant. With the flexibility of Windows the DDM 2909 is Network ready with Internet connectivity allowing remote access to Rudolph Research Analytical’s Service and Technical Support Team.

Refractometers J57AB/J157AM

DDM 2909 Automatic Density Meter

DDM 2909 Automatic Density Meter


Refractometers – Automatic, Digital J57AB & J157AB designed for the Petroleum Industry.

The J57AB and J157AB are the Petroleum specific Refractometers in the Rudolph Research Refractometer Product Line. The Rudolph Research J57AB and J157AM refractometers have temperature control and WU measurement features needed for testing required in the petroleum industry.


Designed specifically for the petroleum industry and specifically for measurement of urea, (WU) in diesel engine fuel additives, in accordance with DIN 70071 and ISO 22241-2.

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Windward Analytical

(949) 636-1080