Technical Specification Item Analog Refractometer Type Hand Held Range 1.000 to 1.050% Automatic Temperature Compensation Yes Accuracy +/-0.0003 Resolution 0.2 Function Determines The Urine Specific Gravity, Serum Protein, or Refractive Index By Measuring The Degree of Which Light Bends As It Passes Through The Sample Features Clinical Scale Display, Single Hinged Daylight Plate with Retention Plunger, Non Roll Stand, Rubber Grip, All Metal Housing, Glass Prism, Rubber Eye Cup, Calibration Screw, Lanyard, LED Illumination Length 9 Width 1-1/2 Height 2 Dia. 2 Includes Calibration Screwdriver, (2) Sample Applicator, Carrying Case, Batteries Manufacturers Warranty Length 2 yr. This listing is for each.