1x Triangular Scale Ruler. Or you can ask your friend for help. Clear black markings on each side. Glad to deal with you in the future. Three different coloured furrows for easy reference (red, green, yellow).
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Westcott Plastic Zero Centering 18-Inch Ruler (CR-18), 41% OFF
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Westcott Plastic Zero Centering 18-Inch Ruler (CR-18), 41% OFF
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WESTCOTT E-15990 00 12 / 300 mm Magnetic Strip Ruler £9.06
Westcott Plastic Zero Centering 18-Inch Ruler (CR-18), 41% OFF