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See The New Mathomat R300 Ruler
Ratios: 1: 125, 250, 400, 800, 1200, 2500, 4000, 8000
Ratios: 1: 125, 250, 400, 800, 1200, 2500, 4000, 8000
Ratios: 1: 125, 250, 400, 800, 1200, 2500, 4000, 8000

91712 Ratios: 1: 125, 250, 400, 800, 1200, 2500, 4000, 8000 - Hand scale ruler, 300mm

$4.95 AUD