This Pet Medical Clinical Refractometer is used to measure the following items: 1. The Specific Gravity of Large Animal's Urine, especially dog. 2. The Specific Gravity of Cat's Urine. 3. The Concentration of Serum Protein or Plasma Protein.It is equipped with Automatic Temperature Compensation (ATC), so that the refractometer is automatically adjusted to correct temperature discrepancies of environment temperature. Features: Triple-scale design to measure the Specific Gravity of Cat's and Dog's Urine, and the concentration of Serum Protein or Plasma Protein. Easy to use, sturdy design, compact in size and light in weight, convenient to keep up and carry around. We provide Manual in English, Russian. With Built-in ATC (Automatic Temperature Compensation) from 10~30 degree Celsius. Soft Rubber eyepiece for comfortable viewing Equipped with scale measurement which provides direct reading Accurate testing results guaranteed Made of premium material, durable in use Adjustable manual focusing Use ambient light only which means battery or power source is not required Specification: Model:RZ126 Measuring Range Specific Gravity of Dog: 1.000~1.060 SG (Resolution: 0.001 SG) Specific Gravity of Cat: 1.000~1.060 SG (Resolution: 0.001 SG) Concentration of Serum or Plasma Protein: 2~14g/dl (Resolution: 0.2g/dl) ATC (Automatic Temperature compensation) range: -10~30 C (50~86 F) Weight: 249 g / 8.8 oz(approx.) Package list: 1 x Refractometer 1 x plastic pipette 1 x mini screwdriver 1 x Clean cloth 1 x instructions