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See The New Mathomat R300 Ruler
Ratios: 1: 1000, 1250, 2000, 2500
Ratios: 1: 1000, 1250, 2000, 2500
Ratios: 1: 1000, 1250, 2000, 2500

9212 Ratios: 1: 1000, 1250, 2000, 2500 - Hand scale ruler, 300mm

$4.95 AUD