Operation 1: Open the cover and wipe the surface of the cover and prism clean with a soft cloth.

2. Drop the liquid on the surface of the prism with a pipette, close the cover plate and gently press it. Turn the freezing point tester towards a bright spot, rotate the eyepiece to make the field of view lines clear, and read the value of the light dark boundary line on the corresponding ruler on the dividing plate.

3. After testing, wipe the cover plate and prism surface clean with a soft cloth, clean the straw, and store the instrument in the packaging box.

4. When measuring battery fluid, be careful not to sprinkle it on the skin and eyes to prevent burns, and carefully wipe the instrument after testing.

　　

Precautions for antifreeze freezing point tester;

1. Do not place it in an environment with a relative humidity greater than 85% for a long time to avoid affecting the optical system.

2. Do not put liquids or water into the adjustment knob and eyepiece to avoid damaging internal components.

3. Do not jump or collide to avoid damaging the accuracy of the instrument.

4. Immediately wipe the prism and refractive plate clean with a clean cloth after use.