This 4-in-1 refractometer set provides quick, reliable readings for key vehicle fluids and battery condition. It is designed for both DIY car care and professional service, with a storage box for easy transport and organization. - What it measures - Antifreeze freezing point: 5 deg C - Windshield washer fluid freezing point: 5 deg C - Vehicle urea concentration (DEF): 0.2% - Battery electrolyte specific gravity: 0.01 - Key benefits - Accurate, fast readings to prevent cold-weather issues and maintain visibility - All-in-one tool reduces the need for multiple devices - Boxed set makes storage and transport simple for shops or home use - Use scenarios - Pre-winter maintenance: verify antifreeze and washer fluid performance - Routine service: quick checks during vehicle maintenance - Fleet care: monitor DEF quality and battery condition across vehicles - Why it stands out - Function: four measurements in one device for streamlined checks - Compatibility: designed for common automotive fluids and battery monitoring - Performance: dependable readings with a protective storage box included