Density Hydrometer

for accurate Liquid Measurements

Our high-quality density hydrometers enable the reliable determination of liquid density in accordance with all common national and international standards, such as DIN, ASTM, BS and many more. They are suitable for use in laboratories, industry, quality control and environmental analysis. Whether for purity testing, concentration measurement or process monitoring – with a density hydrometer from Ludwig Schneider you obtain precise results. This makes our instruments an indispensable tool to measure density of liquids in a wide variety of applications.

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WIDE RANGE of density hydrometers
for every Application

Our product range includes a wide selection of density hydrometers tailored to different measuring ranges, typically from 0.600 to 2.000 g/cm³. Depending on your requirements, we offer models with or without an integrated thermometer, allowing both density and temperature to be read simultaneously.

For particularly demanding measurements or special liquids, we can customize scales, graduations and immersion depths individually. This ensures you receive the right tool to measure density for your specific application.

Quality made in germany
density hydrometers with DAkkS Calibration

Every density hydrometer from Ludwig Schneider is manufactured from high-quality glass and individually tested by hand. For your quality documentation, we provide, upon request, either a works calibration certificate or a DAkkS-traceable calibration certificate. These certificates verify traceability and accuracy in density measurement, an essential criterion especially for standard-compliant processes or accredited laboratories.

Ludwig Schneider: Herstellung made in Germany
Alkoholometer des deutschen Herstellers Ludwig Schneider
Alkoholometer des deutschen Herstellers Ludwig Schneider

Density Hydrometers with Integrated Temperature Measurement

Liquid density is temperature-dependent. Therefore, we calibrate our density hydrometers to reference temperatures such as 20 °C, 15 °C or 60 °F, depending on the application. For precise results under fluctuating ambient conditions, we recommend our models with an integrated thermometer for reference temperature. They allow simultaneous recording of both temperature and density.
We are also happy to manufacture special solutions, for example for specific liquids or unique requirements in density measurement.

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We gladly supply a works calibration certificate or a traceable DAkkS calibration certificate upon request.

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Unique all-round service by our Ludwig Schneider Messtechnik GmbH

Our DAkkS calibration laboratory is accredited according to DIN EN ISO/IEC 17025:2018 for the measurands temperature and density. We measure temperatures from -196 °C to 1,820 °C and guarantee the highest precision according to all international standards. Together with our extensive product range and our modern calibration laboratory, we offer you a comprehensive all-round service.

DAkkS calibration laboratory Ludwig Schneider Messtechnik

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TECHNICAL DATA

FEATUREVARIANTS
Measuring range0.600 to 4.000 g/cm³
0,995 to 1,038 SG
-5 to +60 g/l
ResolutionUp to 0.0001 g/cm³
0.001 SG (± 0.001 SG)
1 g/​l (±1 g/​l)
Accuracy±0.0001 g/​cm³
Reference temperature+15 °C
+20 °C
68/​68 °F
TypesRange finders

Hydrometers acc. to ASTM E100-19

Hydrometers for heavy liquids

Precision hydrometer sets acc. to DIN 12791 und BS 718

VariantsWith integrated thermometers

Without integrated thermometers

Thermometer fillingOrganic

Metallic

AccessoriesCylindrical stands made of glass

Instrument cases

FAQ

A density hydrometer is a simple but precise tool to measure density of liquids. It floats in the liquid and indicates the density value on a scale. Depending on buoyancy, the hydrometer sinks to a certain depth: the denser the liquid, the higher it rises. This allows the density of a liquid to be measured directly and reliably.

The density of liquids changes with temperature. Therefore, density measurement with a hydrometer must always be carried out at a defined reference temperature, usually standardized at 20 °C. Many of our models are equipped with an integrated thermometer, enabling simultaneous reading of both density and hydrometer temperature.

Our density hydrometers can be supplied with either a works calibration certificate or a DAkkS-traceable calibration certificate. These certificates guarantee maximum accuracy and traceability – an essential requirement for many industries with strict quality standards.

Yes. Depending on the liquid and measuring range, we offer specialized density hydrometers for a variety of applications, for example acids, alcohol, milk, or technical oils. We also provide custom-made solutions with specific scales, measuring ranges, or temperature adjustments tailored to your needs.

The reference temperature indicates the temperature at which the hydrometer was calibrated during production. Since liquid density varies with temperature, the liquid sample should ideally match this reference temperature to ensure precise results.

A calibration mark would alter the weight of the hydrometer. Instead, the mark is applied to the protective plastic sleeve of the instrument. For this reason, the packaging of calibrated hydrometers should not be discarded.

For precise density measurement, you need a tall measuring cylinder, the liquid sample, and the density hydrometer. The cylinder should be at least as tall as the hydrometer itself. As a rule of thumb, the inner diameter should be at least 20 mm larger than the hydrometer’s diameter, so that there is a minimum distance of 10 mm between the hydrometer and the cylinder wall. This ensures the hydrometer can float freely and display the correct value.

To achieve reliable results, fill the measuring cylinder with the sample liquid and place it on a stable, level surface. Before use, check the hydrometer for contamination and clean it if necessary. Insert it carefully into the liquid with a slight rotating movement until it stabilizes. It is important that the hydrometer floats freely and does not touch the bottom or the cylinder wall. Once it has reached equilibrium, you can read the density value directly from the scale at the liquid surface.

Request a quote for density hydrometers

Are you interested in density hydrometers? We look forward to your inquiry!

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