Available in 2 lengths 30cm and 15cm coloured coded for two different scale options. 15cm Scale Options: SRM6215 Blue Ratios - 1:1, 5, 10, 100, 20, 200, 50, 500 SRM6315 Red Ratios - 1:1, 100, 20, 200, 25, 250, 50, 500 30cm Scale Options: SRM6230 Blue Ratios - 1:1, 5, 10, 100, 20, 200, 50, 500 SRM6330 Red Ratios - 1:1, 100, 20, 200, 25, 250, 50, 500

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