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MR32ATC - Brix Refractometer 

 
Specifications 

Scale Range Resolution 

Brix scale: 0 - 32 
Dimensions 7.6 x 1.5 x 1.5" (194 x 38 x 38mm) 
Weight Approx. 8.0 oz. (227g) 

 

                 
 
  
                      
 
 
                           Shadow-line

 

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Operation 

This instrument measures the refractive index of the sample and displays the result in Brix scale. 
 

1. Zero Adjustment 

Put distilled water on the prism; enough to cover the entire prism. Close the cover plate and rotate 
the adjusting screw so that the light/dark boundary line (known as the shadow-line) evens up with 
the zero line. After the zero adjustment, clean the prism with soft cloth.  

 
2. Sample Preparation and Reading 

To take a reading, place a few drops of a sample liquid on the measurement prism. Ensure that 
enough solution is added to the prism in order to cover the entire prism. Close the prism so that 
the liquid spreads across the entire surface of the prism without air bubbles or dry spots (see 
diagrams below). Allow the sample to remain on the prism for approximately 30 seconds. While 
holding the instrument under a light source (

do not

 use florescent light) look through the 

eyepiece. The brix concentration is determined by the intersection of the boundary of the light 
and dark fields (known as the shadow-line) on the printed scale. If the scale appears out of focus, 
the eyepiece may be adjusted by rotating the knurled portion. The instrument also features an eye 
guard to prevent stray light from entering the eyepiece and causing reflections. It may be 
necessary to adjust the position of the light source to maximize the contrast of the shadow-line. 
Under normal conditions, optimal contrast is obtained by holding the instrument underneath and 
perpendicular to a light source. (florescent light is not recommended) - Once a reading has been 
taken, wipe dry with a clean cloth (do not wash or rinse) and place the instrument in the supplied 
plastic case. Store the instrument in a safe, dry environment.  
 
 
 

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