The RHA series are designed for measuring the concentration of the
battery fluids, the freezing point of antifreeze liquid and
windshield cleaning fluid. With the indication of the percentage
you may know at which temperature the fluid will be frozen for both
propylene glycol and ethylene glycol. It can also be used for
checking the strength of electrolyte solution battery.
This model’s usage is same as RHA-100. But its freezing point unit
system is °C.