The Bulk Reef Supply AWR1-1-AP Portable Refractometer is a handheld refractometer designed for use in a biological laboratory. This compact and portable device allows users to quickly and accurately measure the refractive index of various solutions, making it ideal for a wide range of applications in marine biology, environmental monitoring, and water quality testing. With the trusted brand of Bulk Reef Supply, users can rely on the precision and reliability of this handheld refractometer for their research and testing needs.