Must Hydrometers – Dual and Triple Scale

Must hydrometers are glass instruments used to measure the sugar concentration in fermentable liquids such as grape, barley or apple must. This analysis is essential for monitoring fermentation and estimating the final alcohol content during the production of wine, beer or cider.

We offer dual and triple scale models that allow direct readings without additional calculations. The scales combine Baumé degrees (°Bé), density (kg/m³), and probable alcohol content (% v/v), making it easier to monitor the fermentation process in technical, artisanal or educational settings.

All models are calibrated at 20 °C, ensuring reliable results under standard conditions. If measurements are taken at a different temperature, the appropriate correction should be applied using specific tables. A difference of just a few degrees can significantly affect the final reading, so it is essential to keep the sample at the correct temperature. The liquid must be still, clean, and free of bubbles to obtain an accurate reading.

The operating principle is based on flotation: the higher the sugar concentration, the higher the must density and the less the hydrometer sinks. The reading is taken at the point where the liquid intersects the visible scale on the stem.

Available models:

• Dual-scale must hydrometer – Baumé and probable alcohol, length 260 mm.
• Dual-scale must hydrometer – density and probable alcohol, length 310 mm.
• Triple-scale must hydrometer – Baumé, density and probable alcohol, length 290 mm.

These instruments are made of durable glass, designed for repeated use in laboratories, wineries, microbreweries, home brewing, training centres, quality control facilities or educational workshops.

The glass body features coloured markings to enhance visibility during reading. Their simple operation and clear scale make them a practical and reliable tool for all types of users, from technical personnel to independent producers and students.

All models come with an individual plastic case that protects the instrument when not in use, ensuring long-term durability.

For safe and accurate measurements, it is recommended to use an ungraduated glass cylinder suited to the instrument’s dimensions. We offer a specific model with a 300 ml capacity, 40 mm internal diameter and 300 mm total height. This cylinder ensures stability thanks to its round base and smooth rim, allowing vertical immersion of the hydrometer and undistorted readings.

You may also be interested in other complementary measuring instruments from our catalogue, such as alcoholmeters, liquid balances and hydrometers in various scales depending on the analysis required. For dedicated must measurement, we also offer special single-scale models such as the Baumé hydrometer (ref. 410.013).

Also check other complementary measurement solutions available in our catalogue, such as alcoholmeters, liquid density testers, and hydrometers with various scales depending on the type of analysis required. For exclusive must measurement, we offer special models such as the Baumé hydrometer with a single scale (ref. 410.013).
We also offer handheld refractometers designed for specific applications:

• For alcohol: 0–80 % scale (ref. 720.5010).
• For oenology, with measurement ranges: 0–22 ° Baumé, 0–25 % probable alcohol, 0–40 % Brix, and a graduation interval of 0.2 units on each scale (ref. 720.5010).
• For beer, dual CAT scale: 0–32 % Brix and Specific Gravity (SG) 1000–1120 kg/cm³ (ref. 720.5010).