LW Scientific Refractometer - Manual

P. 770.270.1394 F. 770.270.2389 865 Marathon Parkway Lawrenceville GA 30046
Refractometer
Instruction Manual
Refractometer
Adjusting Focusing Eyepiece
A Prism
B Cover Plate
C Calibration Screw
D Tube
E Focusing Eyepiece
CTL-REFM-PRSG: Protein / Specific Gravity Refractometer
Total Protein in serum Range: 0 to 12 g/dl Resolution: 0.2 g/dl
Specific Gravity in urine Range: 1.00 to 1.05 sg Resolution: 0.002 sg
CTL-REFM-BR32: BRIX Refractometer
Brix sugar content Range: 0 to 32 % Resolution: 0.2 %
Size: 30 x 160 mm
Weight: 215 g
Note: Always treat specimen samples as though they were infectious. When using the Refractometer, keep it horizontal
as you look into the eyepiece, so that the specimen sample will be less likely to drip out and contaminate the user
and/or the surroundings. Clean the refractometer between samples and when done using the instrument according
to the guidelines contained within these instructions.
This device has a built-in automatic temperature compensation that ranges from 10 degrees C to 30 degrees C (50 to
86 degrees F)
Calibration
Prior to inserting a sample, aim the front of the Refractometer toward a bright indoor light source. Adjust the focusing
eyepiece ring (fig. E) until the graduations on the scale can be clearly seen through the eyepiece.
Lift the cover plate (fig. B) and add 1 or 2 drops of distilled water on the surface of the prism (fig. A). Lower the cover
plate, making sure that the water covers the entire surface of the prism. View the scale through the eyepiece and,
using the enclosed small screwdriver, turn the adjustment screw (fig. C) to make the light/dark boundary coincide
(meet) at the “W” at the bottom of the protein scale (Protein / SG model) or at the 0 % mark (BRIX model). Using a
soft cotton cloth or absorbent paper, clean and dry the prism before measuring the first specimen.
A
B
C
D E
Two Models Available:
CTL-REFM-PRSG: Protein / Specific Gravity
CTL-REFM-BR32: BRIX