This used digital refractometer from Milwaukee is a cutting-edge device for measuring the salinity of seawater. With its accurate readings and user-friendly interface, it's perfect for aquarium enthusiasts looking to maintain a healthy and sustainable aquatic environment. The device is designed with quality in mind, featuring a durable construction that is built to last. Whether you're a seasoned professional or just starting out, this digital refractometer is the perfect addition to your aquarium toolkit.