Bumper Liquid Timer Set Assorted 14pcs
A set of colourful liquid timers.
Turn these colourful liquid timers upside down and watch the bubbles fall and bounce to the bottom then float back to the top. Colours and styles may vary.
reliable quality products
these are a real good resource
one has already cracked yet the last ones took along time to crack
The pupils are able to manage their time better and gain an understanding of how long things lake.