Durable construction with a clear, easytoread scale for precise readings every time. Easy to use and portable handheld design for convenient onthego testing. Helps ensure the correct ethylene glycol concentration for performance and longevity of your vehicle cooling system. Accurately measures ethylene glycol concentration in water or battery fluid with this handheld refractometer. Use scenarios Automotive maintenance: verify antifreeze concentration in radiator coolant to ensure proper freezing and boiling protection and maintain cooling system efficiency. Battery care: test ethylene glycol concentration in battery fluid to detect dilution or contamination and support battery health. Field service: perform quick onsite checks during fleet maintenance, DIY projects, or mobile technician visits to keep cooling and electrical systems operating reliably.