The following are 5 Advices That You Must Listen Before Using the Zipper Tester. source: http://thentest.com/News-and-events/1786.html 1. Read the manual Before using the Zipper Tester, you should read the instructions for the device and make sure that you are able to operate it correctly. If you are unsure of any of the operating instructions, please consult the manufacturer of the device. 2. Regular maintenance and calibration The Zipper Tester requires regular maintenance and calibration to ensure that the equipment is working properly. The manufacturer of the equipment should provide the appropriate maintenance and calibration manuals and it is recommended that these are followed.