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See The New Mathomat R300 Ruler
CTM9012 Ratios: 1: 2.5,5,10,20,50,100 - Hand scale ruler, 300mm
CTM9012 Ratios: 1: 2.5,5,10,20,50,100 - Hand scale ruler, 300mm
CTM9012 Ratios: 1: 2.5,5,10,20,50,100 - Hand scale ruler, 300mm
CTM9012 Ratios: 1: 2.5,5,10,20,50,100 - Hand scale ruler, 300mm
CTM9012 Ratios: 1: 2.5,5,10,20,50,100 - Hand scale ruler, 300mm

CTM9012 Ratios: 1: 2.5,5,10,20,50,100 - Hand scale ruler, 300mm

$7.95 AUD