This plastic thermometer with a white border is weatherproof and can be used indoors or outdoors. By monitoring the indoor temperature, you can save on heating costs—up to 6% with a one-degree temperature reduction. And you will simply feel more comfortable. When mounted outdoors, it provides the outdoor temperature as important information for home, garden, leisure, and work. The capillaries are filled with a specially colored thermometer liquid. Mercury has not been used for this purpose for a long time.