4 years & up. Relaxing and incredibly visual, timers can be calming and soothing to watch. Each lasts for approximately one minute. Use as a transition tool, in science centers, light table exploration or use as a relaxation tool. Made from durable acrylic and sizes range from 5.25"H to 6.5 " H.
4 years & up. Each liquid motion hourglass is 3"H with an hourglass shaped display and runs approximately one minute. Made of thick acrylic plastic. Once the colored drops have all reached the bottom, simply turn it over to restart the action. Set of 4: blue, red, green, and pink.