The ultimate map measurer for expert navigators, the Brooks-Range Map Tool offers scales for 10 ruler scales covering the common map scales used by the USGS, Forest Service, BLM, Alaskan and European maps. Scales included are:

1:100,000
1:63,360
1:62,500
1:50,000
1:25,000
1:24,000
UTM (Universal Transverse Mercator) Grid
The tool also includes slope scales for the following scales that can be used for assessing avalanche danger as well:

1:25,000 (40m, 20m, and 10m)
1:24,000 (40m)
1:50,000 (40m and 20m)
1:62,500 (100ft.)
1:63,360 (100ft.)
1:100,000 (50m)
It also includes the following UTM Reader scales in 1 and 10 Km units:

1:24,000
1:25,000
1:250,000

Its length of 7" allows the user to draw long lines.
Features include:

7" x 4.625"
Slope indicator with avalanche danger zone
Compass Rose
Measurements in feet and meters
Lightweight but durable clear plastic