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    Butter pen (mark pen) 
    
                    
    
                        
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    Applicable scope
    
                            
    Test principles and standards
    
                            
    Instrument characteristics
    
                            
    Configuration list
    
                
    
                
    
                    
    
                        
                    
    
                    
    
                        
                    
    
                    
    
                        
    
	Product Name: no butter pen. 
    
 Detailed description: the inextinguishable butter pen is a never fading marker, which can be used in all tests. 
    
 There are four colors of yellow, red, black and green. 
    
 Product size and packaging: 6 thick pen per box. Fine pen 12 pieces per box. 

    
                    
    
                    
    
                        
                    
    
                
    
            
    
        
    
    
    

    


  
    



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