Lava lamp timer
A lava lamp timer that a child can read and touch. The wax drips down as time goes. Set 1 to 30 minutes. Free, with no ads and no account.
What the child sees
The wax drips down as time goes.
What the child can touch
When it is all at the bottom, time is up. Tap the lamp, or swirl it. Play does not change the time.