• Accurately measures the strength of battery fluid, screenwash and antifreeze by measuring the refractive index of light passing through the mixture.• Suitable for synthetic antifreeze mixtures including long-life OAT (Organic Acid Technology) and G13.• Temperature corrected prism ensures accuracy.• Eyepiece with adjustable focus.• Supplied with pipette and storage case.Accurately measures the strength of battery fluid, screenwash and antifreeze by measuring the refractive index of light passing through the mixture. Suitable for synthetic antifreeze mixtures including long-life OAT (Organic Acid Technology) and G13. Temperature corrected prism ensures accuracy. Eyepiece with adjustable focus. Supplied with pipette and storage case.• Accurately measures the strength of battery fluid, screenwash and antifreeze by measuring the refractive index of light passing through the mixture. • Suitable for synthetic antifreeze mixtures including long-life OAT (Organic Acid Technology) and G13. • T