YS015-1
$44.99
Filled with red sand, crafted of resin and exquisite in detail this unusual hourglass is a great collectible! 4 minute timer.
$19.99
The Newton gravity glass is an awesome desk-topper and a question-generating educational tool. When the cylinder is flipped, the sand within the hourglass moves down while the hourglass itself floats...
$16.99
Newton's Gravity Glass is a sand-filled hourglass suspended in a liquid-filled glass cylinder. Measures 3 minutes of time with either blue, yellow, or purple color liquid. A perfect corporate gift!...
$25.99
Newton's Gravity Glass is a sand-filled hourglass suspended in a liquid-filled glass cylinder. When the cylinder is flipped, the sand within the hourglass moves down and the hourglass itself floats...