Create a feel for natural textures with G.W. Schleidt's Mini Glass Sand Timers. Both modern and functional, each timer is filled with mixed sands in complementary colors like this timer with red sand. At just 4” tall, this timer brings just enough accent and color to any setting. 5-minutes per side. An hourglass, also known as a sandglass, sand timer or sand clock, is a device for the measurement of time. The hourglass is named for the most frequently used sand glass, where the sands have a running time of one hour. Once all the sand has run to the bottom bulb, the device can be inverted to measure time again.