Good morning:
In response to your enquiry, we need to know the Baumé scale of this chemical product. Once confirmed, we will be able to indicate the correct reference you should purchase together with the glass measuring cylinder, which is 524.017.

To use a hydrometer (aerometer for liquids) in a cylinder:

1. Prepare the materials:
   • Clean the glass cylinder and rinse it with a small amount of the liquid to be measured to avoid contamination.
   • Select a hydrometer suitable for the expected density; if it sinks too much, it is not the correct range.
2. Fill the cylinder:
   • Pour the liquid into the cylinder without overfilling it, avoiding overflow when inserting the hydrometer.
   • Ensure the product temperature is correct; otherwise, use equivalence tables.
3. Insert the hydrometer:
   • Hold it from the top and gently introduce it into the liquid.
   • Spin it slightly with your fingers so it does not stick to the cylinder walls and can float freely.
4. Allow stabilisation:
   • Let the hydrometer float freely and vertically without touching the bottom or the sides of the cylinder.
5. Take the reading:
   • Position your eyes at the liquid level and observe the graduated scale.
   • Read at the bottom of the meniscus (the curve formed by the liquid surface). This point on the scale corresponds to the relative density of the liquid.

Which instrument is used to measure grape must?

Grapes do not have "degrees" per se; what is measured is the sugar content in the must, which helps estimate probable alcohol content. We recommend two instruments:

• Handheld refractometer with 3 scales – Ref. 720.5150
  View product
  Measures °Brix, Baumé and probable alcohol. Requires only 2–3 drops.
• Mustimeter (glass hydrometer) with 2 scales – Ref. 414.
  View product
  Used with a 250 ml glass cylinder.
  Recommended cylinder

Both options are reliable, but the refractometer is more practical and faster.