Temperature Strips are placed on the fabric being sent through the dry to determine the temperature on the garment surface. For black shirts, it is recommended to place the temperature strip inside the shirt. Ink deposits on black shirts are thicker than on white shirts, requiring the shirt to be in the oven longer, for the ink to reach the proper cure temperature.
Peel 1 strip off of the card and place it on top of the garment, and send the shirt & strip into the dryer. The temperature block that turns black on the strip, will be the temperature shown.