Product review for Ball and Ring Device Please read our review guidelines and see the terms of use of posting a review. Overall Rating: and share your thoughts with other customers Sort Reviews: Newest | Oldest | Highest Rating | Lowest Rating  NEXT :: Viewing page 1 of 2  -  Sunday, January 11, 2009 ball and ring device out of tolerance Reviewed By: Houston (Gaithersburg, MD) I heated the ball to sizzling temperature >200C and froze the ring to -25C and the ball still cleared the ring (with a sizzle from the frost). Conclusion: the several mm disparity in diameter is clearly out of specifications. Looks good, doesn't work. Background: Ph.D. Physiologist and Biophysicist.  -  Wednesday, January 14, 2009 Tolerances too loose Reviewed By: DS (Buena Vista, CO) I found that tolerances on dimensions are too loose to demonstrate thermal expansion without special equipment.  -  Wednesday, January 14, 2009 no good Reviewed By: debbie (new york, new york) the ball and ring apparatus simply does not work. i had it in boiling water for 10 minutes and it still easily fit through the ring. im disappointed because i know my students would have loved this. aren't these things tested before they are sold?  -  Sunday, October 11, 2009 Tolerances too loose Reviewed By: EC (Glenn Dale, MD) This is a disappointment. The tolerances are indeed way too loose to make a good demo.  -  Saturday, October 20, 2007 attention getter Reviewed By: Shawn (Colorado Springs, CO) This is really a great way to show kids how temperature can change things.

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