refractometry
noun
                                                                                                                            
                                                            re·frac·tom·e·try
                    
                                                                                                              
                                                                                                                                  -ˈtäm-ə-trē 
                                                      
                                                          
            
            
               plural refractometries            
        
    
                                
              
          
                                                      : the art or process of measuring indices of refraction : the use of the refractometer                                      
                
                    
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