REAFFIRMATION
OF GUARANTY

      


      The undersigned, being the Subsidiary
Guarantor of the obligations of BIOANALYTICAL SYSTEMS, INC. (the “Borrower”) to NATIONAL CITY
BANK (the “Bank”),
hereby consents to the Fourth Amendment to Amended and Restated Credit Agreement
between the Bank and the Borrower, and further agrees that the execution and
delivery of such Fourth Amendment shall in no way affect, impair, discharge,
relieve or release the obligations of the undersigned under its Replacement
Subsidiary Guaranty dated as of January 4, 2005 in favor of the Bank, which
obligations are hereby ratified, confirmed and reaffirmed in all respects and
shall continue in full force and effect, until all obligations of the Borrower
to the Bank are fully, finally and irrevocably paid and performed.

      


      Dated July _____, 2009.

       

      
        
          
            
              
                
                  
                    
                      
                        
                          	      
                                  SUBSIDIARY
      GUARANTOR

                                
	 
	
                                        
                                    BAS
      EVANSVILLE, INC.

                                  

                                
	 
      	 
	
                                  By:

                                	 


                        

                      

                    

                  

                

              

            

          

        

        
          
            
              
                
                  
                    
                      
                        	
                                Printed:

                              	 


                      

                    

                  

                

              

            

          

          
            
              
                
                  
                    
                      
                        	
                                Its:

                              	 


                      

                    

                  

                

              

            

          

        

        
          

            
              	
                      STATE OF INDIANA

                    	
                      )

                    
	 
      	
                      )SS:

                    
	
                      COUNTY OF ____________   

                    	
                      )

                    


            

          

        

      

      


      Personally appeared before me, a Notary
Public in and for said County and State, _________________________,
____________________ of said corporation, known to me as the person named
herein, who after being duly sworn upon his oath, stated to me that he has been
duly authorized and empowered to execute the foregoing Agreement on behalf of
said corporation.

      


      In Witness Whereof, I have hereunto set
my hand and Notarial Seal, this _______ day of July, 2009.

       

      
        	
                My
      Commission Expires:

              	 
      	 
      	 
      
	 
      	 
      	 
      	
                Notary

              	 
      
	
                My
      County of Residence:

              	 
      	 
      	 
      
	 
      	 
      	 
      	
                Printed