The G.W. Schleidt 5-Minute Newton Glass Timer features yellow liquid with an hourglass timer with white sand. When the glass cylinder of this fascinating sand timer is flipped, time is measured by the dropping sand, while the timer bubble floats to the top. This beautiful Glass Timer will make a statement on any table or in any setting as well as being useful. Available in other colors and as an 3-minute timer on Amazon.com.