Refractometer for estimation of water content in (cow) milk

This optical refractometer for estimation of water content in milk in the range from 0 to 20 %.

The measurement

The measuring of water content in milk is quite easy. It is done in two steps, when you place a few drops of measured liquid onto the prism, press slightly the cover plate to eliminate possible bubbles as well as air and the light/blue boundary will show you the result value.
For the most accurate measurement results must be respected the reference temperature of 15 °C.

The measurement evaluation

Tip: use our calculator - The estimation of water content in milk

1. In the first step it is necessary to apply a few drops of undiluted milk onto the prism. We note the result "V1" (e.g. 9 %), we use it later.
2. In the second step we measure the water diluted milk. We again note the result "V2" (e.g. 7.8 %), we use it in the next step.
3. We put both previous results into equation X = 11 * (V1 - V2). For example X = 11 * (9 - 7.8) = 13.2 %
4. The accuracy of results obtained by using this method is ± 5 % of additional water content.

General technical specifications

• Reference temperature is 15 °C
• This refractometer is not equipped with automatic temperature compensation
• Possibility of focusing
• Length ~ 160 mm
• Quality technical design, metal body
• Package contents: durable plastic case, refractometer, cleaning cloth, plastic pipette, screwdriver, operating instructions in English

Scale of the refractometer RMK2