This professional 4-in-1 automotive refractometer delivers all-in-one fluid testing for car maintenance, perfectly built to measure AdBlue urea concentration (30%-35%), antifreeze freezing point, battery electrolyte specific gravity and windshield washer fluid freezing point. Equipped with built-in ATC automatic temperature compensation, it eliminates temperature interference and ensures stable, accurate readings between 10℃ to 30℃ without manual correction.

Crafted with high-transmittance optical prism and anti-slip rubber grip, the lightweight aluminum body resists corrosion for long workshop service. Its large clear dual-scale lens lets you get reliable data in seconds: just drop liquid on the prism, cover the plate and read under natural light. No batteries or extra reagents required.

Compact and portable for mechanics, fleet managers and DIY car owners, it avoids costly SCR catalyst damage caused by unqualified urea fluid. Full accessories including dropper, calibration screwdriver and storage case are included for immediate use on-site inspections.