Easy to read and accurate, the Rotring triangular reduction scale surveying T6 is a must-have for any student or professional. Made with high-quality plastic, this ruler has dimension markings on both sides for easier reading and work. Two coloured flutings for simple use. Scales: 1:500, 1:1000, 1:1250, 1:1500, 1:2000, 1:2500.