The sand timer is suitable for use in the sauna room, allowing you to monitor the fixed time interval of 15 minutes. 15 minutes-the popular length of time to enjoy sauna. It also includes 5-minute and 10-minute approximate markers for shorter sessions. Accuracy-accurate to within . The hourglass is fixed in place with high-temperature adhesive and small metal fasteners. Just use the 2 screws provided to install it . Wall-mounted Align the additional wooden mounting strip vertically, screw it into the pre-drilled hole, and hide the mounting strip perfectly behind the hourglass machine. It is best to install the timer opposite the heater and control it by simply rotating it. Even if it is used for a long time, the accuracy of the watch remains unchanged because of the uniform granularity of the annealed and screened sand. specifications Name: wall-mounted hourglass Quantity: 1 piece (with 2 screws) Material: wood+glass colour: green Package Contents: 1 x Wall mounted hourglass Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.