Hydrometers

Hydrometers

Hydrometers are a simple, cost-effective way to measure the specific gravity (relative density) of liquids (the ratio of the density of the liquid to the density of water). All hydrometers contain a scale inside the stem, which allows the specific gravity to be accurately read.

All our handcrafted hydrometers are made from glass by Australian glass craftsmen.

Our range of glass hydrometers includes:

Common uses of hydrometers include measuring the density of beer brew or fuel. For details on both uses, explore our beer brewing hydrometers and fuel hydrometers.

Explore our full range of premium glassware and essential equipment to choose the ideal hydrometer for your workflow. Don’t forget to check our current discounts or reach out to us for expert guidance on product selection.

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FAQs

What is a glass hydrometer and what measurement does it provide?

Glass hydrometers are floating instruments that measure the density or specific gravity of a liquid by how high or low they float. This helps assess concentration, purity or formulation changes.

What types of scales or ranges exist on hydrometers?

Hydrometers may feature specific gravity, density (g/mL), Baumé or specialised industrial scales.

What makes a handcrafted hydrometer different from a standard model?

Handcrafted hydrometers are individually made and finely calibrated, offering improved precision, stability and readability compared to mass-produced models.

How do I use a hydrometer or hydrometer cylinder jar correctly?

Fill your hydrometer cylinder jar with enough sample for free flotation, then lower the hydrometer gently to avoid sticking or oscillation. Take the reading at eye level at the liquid meniscus.

What sample preparation steps are required?

Remove bubbles, ensure the sample is fully mixed and bring it to the calibration temperature (commonly 15°C or 20°C).

What are common errors when using glass hydrometers and how can I avoid them?

Typical errors include trapped air bubbles, dirty hydrometers, using the wrong range and reading above or below the meniscus. Clean the stem, avoid splashing and always match the hydrometer range to your application.

How do I calibrate and maintain my hydrometer for accuracy?

Rinse glass hydrometers with distilled water, wipe gently and store upright. Calibration checks can be done using certified reference liquids.

What cylinder jar size or configuration should I use?

Choose hydrometer cylinder jars tall enough to allow full flotation without the instrument touching the bottom. Narrow cylinders reduce sample volume, but must still provide clearance for movement.

Are there material or chemical compatibility considerations?

Most liquids are safe with glass hydrometers but avoid highly alkaline or HF-containing solutions that can etch glass. Use appropriate jars or protective liners when necessary.