How to measure antifreeze concentrate using a refractometer

We will determine the level of G12 antifreeze concentrate.

For this we need a refractometer and a drop of antifreeze.

Be sure to wipe the reading glass of the device.

We drip antifreeze on the reading glass.

Cover the substance with a lid.

We observe the results on a special canvas with indicators. Clear markings can be observed by holding the device up to a bright light.

In this case, antifreeze is G12, and we see that the freezing point of the liquid is -42.5 degrees Celsius.