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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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