LW Scientific Refractometer - Specific Gravity in Urine /Total Protein in Serum. Simply read the numerical scales through the eyepiece. Rubber grip and optical focus system allow for easy viewing in any environment. Automatic temperature compensation allows for immediate results even when sample temperatures vary. Specifications for LW Scientific Refractometer Specific Gravity in Urine /Total Protein in Serum: Manufacturer: LW Scientific Color: Black/Silver Fabric/Material: Plastic Quantity: 1 Included Accessories: Case Weight: 215 g Package Contents: LW Scientific Refractometer Specific Gravity in Urine /Total Protein in Serum LW Scientific CTL-REFM-PRSG: Refractometer - Specific Gravity in Urine /Total Protein in Serum