彩繪中國地圖 Coloured Drawing Map of China Scenic Spots SC

For measuring distances of roads, streams, etc. on maps with Four scales; 1:75k, 1:50k, 1:25k, 1:20k. The wheel features kilometre measurements on both sides. Use method: Move the pointer to zero, at the scale of 1:1. The small wheel alignment measuring address as a starting point, along rounting slip(rolling) to the end, according to the map of the ratio of the corresponding scale, is up point to the end of the number of kilometers.

Simplified Chinese Size:110*80cm