Automotive Coolant Refractometer with ATCThe antifreeze refractometer can be used for measuring the freezing point of glycol, antifreeze, coolant and battery acid. This refractometer features Automatic Temperature Compensation (ATC), and can also be used for checking the condition of electrolyte solution batteries. Measures the freezing point of automobile antifreeze based on ethylene glycol or propylene glycol. This is a quality optical instrument that includes a soft carrying case, bulb