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suitable for KS3 +. Brass two piece apparatus for demonstrating thermal expansion.
![Bar and Gauge [0860]](https://www.betterequipped.co.uk/media/catalog/product/cache/a4577392614353b76a2e1713f4979a11/b/a/bar_and_guage_1.jpg)
![Ring and Ball One Piece [1629]](https://www.betterequipped.co.uk/media/catalog/product/cache/a4577392614353b76a2e1713f4979a11/r/i/ring_and_ball_one_piece.jpg)
