3 – Scale Hydrometer

High Quality 3-Scale hydrometer manufactured in the UK. Used to measure the amount of fermentable sugar (solids) in your wash as well as help estimate the potential alcohol.

Easy Read Hydrometer for Homebrew Beer, Cider, Wine and distillers

A quality instrument made in the UK by Stevenson Reeves

  • This Hydrometer is specifically designed for easy use.
  • Calculate the Alcohol ABV % in your beer, cider and wine.
  • Tells you what stage your fermentation is at.
  • Tells you when the fermentation is finished.
  • Diagnose/troubleshoot problems.
  • Large, clear easy to read numbers.
  • Scale 1.150-0.880
  • Comes in a plastic storage tube which can be used as a trial jar for easy reading.
  • Simple to understand Instruction leaflet.

The Homebrew Hydrometer is the most versatile instrument you can have in your homebrew tool box.

Instructions for calculating alcohol ABV:
Put the hydrometer into your brew before adding the yeast and take a reading.
When the fermentation has finished, take another reading.
Deduct the 2nd reading from the 1st reading to calculate the alcohol % by volume (ABV).

Also allows you to easily see the progress of the fermentation and when it is finished.
There is also an indication for sweet/medium/dry finished wines and when to start and finish beers.

Please note, we will try our best to pack glass but they are not covered by our courier insurance.


R95.00 VAT Incl.

A hydrometer is a simple device that measures the Specific Gravity (SG) of a liquid. SG is a number which compares the densities of a liquid being tested to a reference liquid. The type normally used by home brewers and wine makers is graduated using water as the reference liquid, usually at a temperature of 20*C.
As sugars are added to water the density increases and therefore so does the SG. As these sugars are fermented they form ethyl alcohol which has a density less than water, and so the effect is to reduce the density of the fermenting liquid, and with it the SG. A typical range of a brewing/wine hydrometer is SG 1.120 to 0.990 (note position of the decimal point).
To find out the SG of the liquid simply immerse a clean hydrometer in the liquid with or without the help of a sample jar. Try to ensure that there are no gas bubbles attached to the hydrometer surface since they could cause the reading to be inaccurate; gently spinning the hydrometer sometimes helps. When the hydrometer has settled compare the liquid level to the scale on the hydrometer.
Note - You should check from your hydrometer instructions where your SG scale reading should be taken, relative to either the liquid level or the top meniscus level. Conventionally hydrometers will require a reading to be taken at the liquid level (as shown in the diagram below). However some hydrometers are available where the instructions state the SG reading is to be taken at the meniscus level (i.e. the opposite of what the diagram shows). If in doubt, test (calibrate) your hydrometer using water at the calibration temperature to confirm how the scale compares to the 'reality'.

Basically that's it.

On a Stevenson Reeves hydrometer commonly used by homebrewers, examples of readings are given in the picture below. However note that the example readings '1010', '1014', and '1040', are incorrectly stated and should be 1.010, 1.014, and 1.040 (again note the decimal point).

For complete accuracy a small temperature correction should be applied to a measured SG, since the densities of liquids do vary with temperature. Online calculators are available to do this, typically

If you intend to apply a temperature correction you should check the calibration temperature of your hydrometer, and take this into account.

The SG measurement taken at the beginning of the fermentation is usually called the Original Gravity (OG) and that at the end Final Gravity (FG).

Tables and calculators are also available to convert SG values to potential and actual alcohol content using the OG and FG values you have taken.

Finally if you suspect that your hydrometer is not reading correctly simply immerse it in clean water at 20*C (or the calibration temperature of your hydrometer) and it should read 1.000.

Additional information

Weight .3 kg
Dimensions 24 × 2 × 2 cm


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