MATERIALS: The sauna thermometer is made of wood, compressed glass and natural white sand, which gives it high heat resistance. That's why it not only allows you to stay safe inside the sauna, but also lasts a long time. VERSATILE USE: This hourglass can withstand high temperatures and steam in the interior of a sauna. It can also be used for other purposes such as classrooms, yoga studios, gymnasiums or other intended uses. DESIGN: The high-quality sand has an attractive color, so the contrast with the wood is very high and the clock is still legible. Elegant design: the color contrast is so strong that it is visible from a few meters away. Rotating clock: the wooden hourglass is easily fixed to the wall using screws. Align the wooden support vertically and hide the support bar perfectly behind the hourglass by pre-drilling the holes with screws.