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Portable Refractometer

Visual refractometer for testing Freezbreaker-LT and other anti-freeze solutions

The Kamco Refractometer 402 has been designed to give a rapid indication of the level of concentration of Freezbreaker and other glycol based anti-freeze compounds. Both the concentration, and the likely degree of protection are indicated.

Freezbreaker is a propylene glycol based anti-freeze compound, and therefore readings should be taken using the propylene glycol scale on the right hand side of the three reference scales.

Antifreeze based on ethylene glycol (such as for automotive applications) should be read on the left hand scale.


Adjustment of zero:

Open the cover plate and put one or two drops of distilled water on the prism. Close the cover plate and press it lightly. Adjust the zero adjustment screw until the light/dark border line coincides with the zero line.

Method of operation:

1. Open the cover plate, clean and dry the surface of the prism with a soft cloth (supplied). Place one to two drops of the solution to be measured onto the prism, using the supplied plastic dropper.

Close the prism plate and press the plate down lightly. Now read the corresponding value where the light/dark border line coincides with the appropriate scale.

2. After taking a measurement, clean away the tested sample which will be on both the prism and the cover plate, using a moist soft cloth. After drying, the refractometer should be stored in a clean, dry environment.

Care and maintenance:

1. Zero adjustment and sample measurements should be carried out at the same temperature – if this varies considerably, then the zero point should be checked and adjusted at least every 30 minutes.

2. Do not immerse the refractometer in water to clean it.

3. As the unit is a precision optical instrument, it should be handled with care. Do not scratch or touch the optical surfaces. Store the refractometer in a dry non-corrosive atmosphere.

4. If the instrument is used in accordance with instructions, the optical performance should not change.

Click below to download the full data sheet/instructions (PDF)

Click here to download the full data sheet/instructions

Technical data:

  • Range:
  • Ethylene glycol: -50°C to 0°C
    Propylene glycol: -50°C to 0°C
    Battery acid: 1.15 to 1.30 S.G.
  • Resolution:
  • Ethylene glycol: 1°C
    Propylene glycol: 1°C
    Battery acid: 0.01 S.G.
  • Weight: 176gm
  • Length: 160mm