Density Meter: You Will Be Surprised By Its Usefulness

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A densimeter is a scientific instrument that is used to measure the density of liquids and solids. It is an essential tool in many industries such as food and beverage, pharmaceuticals, chemicals, and petroleum. A densimeter is also known as a density meter or specific gravity meter. In this article, we will delve into the details of densimeters, their functions, types, and FAQs.

On the scientific level, there are many devices that have been created in order to facilitate tasks in the laboratory. The most common are those that perform some kind of task such as measurements or simplify tedious processes. You will be surprised by the usefulness of the device that occupies the 28th place in our ranking. Continue to get acquainted with the top 30 of the best laboratory materials, in this article - the densimeter.

Definition of the laboratory densimeter

It is an instrument used in the area of measurements that is responsible for determining in a liquid its relative density. As the name implies, it is a density meter, or what is equal to a density meter. They are usually made of glass and their physical constitution determines in which types of liquids it can be used.


Features of the densimeter

Usually made of glass.Possesses a lead or mercury pellet, which will it confers buoyancy.It consists of a hollow cylinder-like shape with a bulb in one of the extremos.Se products tailored to specific needs of the liquids in which it is worked. In some cases it can sink with greater ease. Some examples of a densimeter are: lactometer, salimeter, aerometer, saccharometer, among others.

They employ the principle of Archimedes who says“ "A body fully or partially submerged in a fluid at rest experiences a thrust vertical upward equal to the weight of the volume of fluid dislodged by the body”. So the density meters when immersed in a liquid float, fulfilling that the weight of the apparatus is equal to that of the dislodged volume. Then they will sink depending on the density of the liquid. For this reason comes graduates in average densities.

In liquids denser than water the density meters carry the indication one (1) on the top of the rod. Then the indications increase numerically downwards, since in denser liquids it sinks less.

In liquids with a lower density than water, the density meter it has the indication one (1) at the bottom. The rod is graduated in numbers less than one, as they sink less than this measure.

What is a Densimeter?

A densimeter is a device used to measure the density of a substance. It works by determining the mass of the substance and dividing it by its volume. The result is the density of the substance, which is usually expressed in g/cm³ or kg/m³.

Types of Densimeters

There are two main types of densimeters:

1. Hydrometers

A hydrometer is a type of densimeter that is used to measure the density of liquids. It works by measuring the buoyancy of the liquid. Hydrometers are typically made of glass and have a narrow stem with a bulb at the bottom. The bulb contains lead or mercury, which makes the hydrometer float in the liquid. The density of the liquid is determined by the level at which the hydrometer floats in the liquid.

2. Digital Densimeters

Digital densimeters are electronic devices that use different measurement methods, including oscillation and buoyancy. They are more accurate than hydrometers and are preferred for precise measurements. Digital densimeters are also more expensive than hydrometers and require calibration and maintenance.

Application of laboratory densimeter


The first thing to do is to place the liquid in a test tube or glass of precipitate, a high enough container. To allow us the use of the density meter.

Next we choose a density meter and carefully introduce into the problem liquid. From here there can be two scenario:

If, when releasing the density meter, it goes to the bottom of the container, it is a sign that it should be removed and use one for densities mayores.Si the density meter does not go to the bottom, it is released by giving a small rotation with your fingers. In this way it will fall spinning and will allow make an accurate reading without it getting stuck on some wall of the container.

The container is taken firmly and placed in front of the face so that the liquid is at eye level, in this way appreciate measurement.

About measuring with densimeter

When introducing the density meter into the liquid being rehearsing and this one floats freely. The measurement will be made right at the point where the liquid rubs against the cylinder of the density meter. In which it will be possible to appreciate the graduated scale of it. And will then allow the reading to be performed of the relative density.

According to the theory the density can vary according to the temperature, for this reason the right temperature of the the moment the measurement was made. Then with this the correction of according to the tables already existing in the data books.

The laboratory densimeter is undoubtedly one of the most used instruments in liquid studies. Its usefulness is highly specific and of paramount importance in laboratory work. For all these reasons, it occupies the 28th place in our ranking. Meet a new position of the top 30 of the best laboratory materials in the next edition.


A densimeter is a device used to measure the density of a substance. It works by determining the mass of the substance and dividing it by its volume. The result is the density of the substance, which is usually expressed in g/cm³ or kg/m³.

Functions and Uses of Densimeters

Densimeters are used to measure the density of various substances, including liquids and solids. They are used in many industries, including:

  • Food and Beverage: Densimeters are used to measure the sugar content in beverages, the fat content in dairy products, and the density of syrups and juices.
  • Pharmaceutical: Densimeters are used to measure the concentration of active ingredients in medicines and the density of drug formulations.
  • Chemical: Densimeters are used to measure the density of chemicals, including acids, bases, and solvents.
  • Petroleum: Densimeters are used to measure the density of crude oil, gasoline, and other petroleum products.


Q1. Can densimeters measure the viscosity of a substance?

No, densimeters cannot measure the viscosity of a substance. Viscosity is the measure of a fluid's resistance to flow, and it is determined by the thickness of the fluid. Viscosity is usually measured using a viscometer.

Q2. How do I calibrate my densimeter?

Calibration procedures may vary depending on the manufacturer's instructions. However, in general, densimeters are calibrated using distilled water or a standard liquid with a known density. The densimeter is adjusted until it gives an accurate reading for the standard liquid.

Manufacturers of densimeters

Here are some manufacturers and links to their websites where you can find densimeters:

  1. Anton Paar -
  2. Mettler Toledo -
  3. Rudolph Research Analytical -
  4. Krüss -
  5. Mesa Labs -

Note: This list is not exhaustive and there may be other manufacturers of densimeters as well.


Densimeters are essential tools used to measure the density of various substances in different industries. They come in different types, including hydrometers and digital densimeters, and each has its advantages and disadvantages. If you are using a densimeter, it is essential to calibrate it regularly to ensure accurate readings. With this knowledge, you can confidently use a densimeter to measure the density of different substances accurately.

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