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See The New Mathomat R300 Ruler
Ratios: 1: 1,2,2.5,5
Ratios: 1: 1,2,2.5,5
Ratios: 1: 1,2,2.5,5

9312 Ratios: 1: 1,2,2.5,5 Hand Scale ruler, 300mm

$4.95 AUD