We make this distinction when you start to design your own custom label. ISO calibration labels show a part number or an ID number. This ID # is used for tracing equipment and helps you comply with ISO 9000 and 14000, ISO/IEC Guide 25 and QS 9000 standards. Such label designs must indicate the company's name, the ID #, the date for the activity, the date next due, the person performing the activity and the ID number for the calibration label, itself. Good Manufacturing Practice ["GMP"] labels are simpler – but remain our most popular. While allowing you to still trace calibration and activity schedules, defective batches, testing procedures, etc. they do not have a field, for example, for label ID.