GAIN EXPRESS Battery Optical Refractometer Ethylene Propylene Glycol Coolant

3 Scales in 1 : (1)Battery Fluids Specific Gravity (Density): 1.100 - 1.400kg/l ; (2) Ethylene Glycol Freezing Point: -60 ~ 0°C (66.6%~0%) ; and (3)Propylene Glycol Freezing Point: -50 ~ 0°C (62.4%~0%) 
Monitor reliability of your battery charge & health condition
Ensure all is working properly and not causing problems like rust, prone to freezing, poor charging, poor cooling, etc
Auto Temperature Compensation (ATC), rest easy that your measurements are always accurate regardless of temperature variation
Cushioned with soft and comfortable non-slip rubberized grip, insulate test solution from body heat