●Material: PS plastic ruler, light and easy to carry, perfect for outdoor work ●Size: Measurement range: 0 - 11.8 inches (0 - 30 cm); Ratio: [1/100 1/200 1/250 1/300 1/400 1/500] ●Features: The chamfered corners prevent corners from flaking when dropped and injuries when using ●Easy to use: The triangular ruler is easy to hold in your hand. Smooth surface ensures fast triangle scale and easy cleaning. Triangular scale, with professional quality in the measurement unit ●WIDE APPLICATION: This is an indispensable triangular scale for reading and manufacturing scale drawings such as landhouse surveyors and architects