Apply heat to the label for a few seconds and see the level clearly indicated.
Standard temperature range: 0-27°C, (Purple) Higher temperature range: 25°C - 35°C (Blue) Sizes: 25mm x 250mm and 25mm x 500mm long.
The Label is heated using an industrial hot air gun, hot water or steam. The temperature sensitive colour becomes transparent exposing the white background.
As the temperature sensitive colour changes back to its original colour over the liquid gas content, the precise liquid level is indicated. After the level has been indicated, the Label returns completely back to its original colour ready to be re-activated again, as required.