With the Liquid Timer Double you simply turn them upside down and watch the two differently coloured bubbles simultaneously move to the bottom of the tube.
About Treezy
Treezy.co.uk is the creation of Jamie Roberts and Victoria Meader. As parents of a child on the Autistic Spectrum, and Victoria a BCBA, they can really understand the needs of children, parents and teachers living and working with Autism.
Through Treezy, they seek to provide the best and most appropriate tools, aids and toys for families and educators in the Autism Community.