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See The New Mathomat R300 Ruler
Ratios: 1: 1,5,20,50,100,200,1250,2500
Ratios: 1: 1,5,20,50,100,200,1250,2500
Ratios: 1: 1,5,20,50,100,200,1250,2500

9512 Ratios: 1: 1,5,20,50,100,200,1250,2500 - Hand scale ruler, 300mm

$12.95 AUD