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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.