An instrument consisting essentially of a polarizer and an analyzer, used for polarizing light, and analyzing its properties.
                                                            
                                                     
                        
                                                
                        
                        
                            An instrument for studying the properties of, or examining substances in polarized light.
                                                            
                                                     
                        
                                                
                        
                        
                            a gemological instrument that tests for a gemstone being double or single refractive, and will allow us to find the various crystal axis of the stone