Features: Secure optimal engine defense with this high accuracy antifreeze refractometer, featuring advanced visual technology for accurate freezing point detection of automotive coolant to prevent winter related engine damage. Crafted from premium erosion resistant aluminum alloy, this strong tester outperforms plastic alternatives with enhanced longevity and stable performances in harsh environments. Ideal for both car owners and professional mechanics, this portable tool simplifies routine vehicle maintenance by delivering quick, laboratory grade coolant analysis in seconds. Perfect for winter preparedness checks in homes garages or professional workshops, its compact design enables fast fluid testing during seasonal maintenance or emergencies roadside inspections. Multi functional beyond automotive use, this refractometer doubles as a accuracy instrument for measuring ethanol concentration and other liquid refractive indexes in laboratories or industrial settings. Specifications: Component : Aluminum alloy Size: about 16x4x4cm/6.3x1.6x1.6inch Package Includes: 1xAntifreeze Freezing Detector note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.