Check the listing for details. Extech Portable Refractometer R12. Condition: New. Listed at 64.99 USD. Introducing the Extech Portable Refractometer R12! This innovative device is a must-have for professionals in the medical and lab equipment field. The R12 is a compact and user-friendly refractometer that accurately measures the refractive index of samples, making it an essential tool for lab testing and quality control in various industries. With a focus on precision and ease-of-use, the Extech R12 is designed to provide accurate results every time. Its lightweight and portable design make it easy to use in the lab or in the field. The R12 is also equipped with advanced features such as automatic temperature compensation and a built-in calibration function, ensuring that your measurements are always accurate. Invest in the Extech R12 today and take your lab testing to the next level!