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Since more then 25 years VOS 4000 is an well established hazemeter device.
This apparatus is the widely recognized refference for measuring turbidity in beer.

The results of the turbidity measurements are comparable nomatter using the VOS 4000 or the new designed VOS 4010.
This is the majoradvantage, since a gradual substitution of the 4000 by the 4010 series is now availlable (especially within of big brewery groups).
Turbidity is defined as"expression of the optical property that causes light to be scattered and absorbed rather than transmitted in straight lines through the sample".
In other words, turbidity is the measurement of relative sample clarity. Turbidity is measured by comparison to standard solutions eg. Formazin.

In practice, turbidity measurement is done in cuvettes. However, the measurement can also be executed in bottles of various sizes. Diffferent bottle holders can easily cover the most commonly used bottle diameters.

Mode of action:
The VOS 4010 Hazemeter makes use of the scattered light principle. Scattered light caused by haze particles is measured at an angle of 90°. A light source with red filter is used, operating at light wavelength of 650 +/-30nm (recomendet by MEBAK).
Other wavelength filters are optional and easily exchangeable in the apparatus.

Spare parts:
- cuvette
- cuvette with cap
- bottle holders of different sizes
- lamp
Optiional:
- hood for extra tall bottles
- green filter
- white filter