The Aichose Portable Optical Refractometer is a handheld device designed for measuring the specific gravity of wine in a portable and convenient unit. With built-in Automatic Temperature Compensation (ATC) technology, this refractometer provides accurate readings for both homebrew and commercial wine production. The compact design and lightweight construction make it easy to use anywhere, making it a valuable tool for both hobbyists and professionals in the wine-making industry. This product, originating from China, is a reliable and efficient tool for determining the quality of wine in various settings.