The models have only one unit system: °F and °C.  With the indication of the temperature we may know the freezing point of either ethylene glycol or propylene glycol based cooling systems. It can be used for checking the strength of electrolyte solution batteries.

Ethylene Glycol:   -90°F-32°F ,70°C-0°C,                         
Propylene Glycol: -70°F-32°F ,-60°C-0°C,                          

Resolution:
Ethylene Glycol: 10°F ,5°C
Propylene Glycol: 10°F,5°C
 

Calibration: zero calibration with water at 20°C