The badges have the months 1 to 12 on the top half and the current years on the bottom half. You can use the test adhesive for a long time and determine yourself which test interval you have in your company or on your devices. Take a pair of punch pliers and simply punch out your data so that you can see from a distance when the next test is or the last one was. Your employees will surely observe the test adhesive and inform you of the upcoming test in good time.