The MASTER-SUR/NM is designed for clinical purposes: "Serum Protein", "Specific Gravity of Urine" and "Refractive Index". The plastic body model is designed to be resistant salty and acidic samples. The MASTER-SUR/NM is a good alternative choice when the water resistant feature is not a priority and the Temperature Compensation will be carried out manually. Not equipped with the Automatic Temperature Compensation feature.