Sealey vs0052 refractometer antifreeze battery fluid screenwash adblue sealey vs0052 p this refractometer from sealey accurately measures the strength of battery fluid screenwash antifreeze and adblue reg by measuring the refractive index of light passing through the mixture suitable for synthetic antifreeze mixtures including long life oat organic acid technology g13 and aqueous urea content of adblue reg temperature corrected prism ensures accuracy p sealey vs0052 refractometer