Off white dimensionally stable plastic ruler. Precision divisions are numbered both ways. Dimension markings are in metric for easier working. Two coloured flutings. Ruler Type: Tri Ruler 6 Surveying. Scales: 1: 25, 1: 50, 1:100, 1: 125, 1: 150, 1: 200, 1: 250, 1: 500, 1: 1000, 1: 1250, 1: 1500, 1: 2000, 1:2500.