LARGE PROPORTIONAL CALIPER

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The smallest pair measures 245mm overall & has ratios of 1:1, 1.5:1, 2:1, 3:1 & 4:1. The large calliper is 500mm overall & has the same ratios as the small plus 3 more; 1.25:1, 1.75:1 & 2.5:1. Both have a firm joint system where you can adjust the amount of joint friction you want with the knurled brass thumbscrews. Arms are anodized aluminium.