To encode your own bar code: Click on the module strips on the left to create your bar code, then click here to see if you have coded the correct numbers. To show a particular bar code: Enter your bar code number: Now click here to show the bar code for your number. To see if check-digit is valid: If you have a valid bar code displayed, you can click here to see if the check-digit is correct. To clear the bar code shown: Click here to clear the current bar code and any numbers shown.