TE-RMAG50 manual optical Refractometer is perfect for quickly determining the concentration and freezing point of coolant used in automotive applications. It can be used to determine freezing point of both Ethylene and Propylene Gylcol from -50°C to 0°C . A 3rd scale shows battery fluid Specific Gravity level from 1.100 to 1.400nD To use, pipette 2-3 drops of the sample onto the palate and close the cover flap. Hold the refractometer towards a light source and look through the eye piece. The concentration % will be indicated by a defined line on the scale. Features: • Large, clear display scale • Aluminium body • Soft, non-slip rubber grip and eye piece • Auto temperature compensation (10~30degC) Specifications: Measurement Range Ethylene Glycol -60°C to 0°C Propylene Glycol -50°C to 0°C Battery Fluid 1.100 to 1.400 S.G. Resolution 5% Accuracy +/- 5% Temperature Compensation 10 ~ 30 °C Operating Temperature 10 ~ 40 °C Sample Volume 0.3ml or more Dimension and Weight Length 170mm / 185gm