This model can be used for measuring the freezing point of either propylene or ethylene glycol based cooling systems. This refractometer has the scales for the freezing points of ethylene glycol and propylene glycol just like the Coolant Checkers. In addition to that, it has the scales for the concentration  of those coolants.

乙二醇: -50°C-0°C 0 to 70% VOL

丙三醇: -50°C-0°C0 to 70% VOL   -70°F-32°F ,-60°C-0°C,   
最小刻度值 :
乙二醇:  5°C,5%VOL
丙三醇:  5°C,5%VOL
零点校准：用20°C的蒸馏水在20°C的环境中校准。