UTM Pocket Sized Corners / Roamers by MapTools
1:24,000, 1:25,000, and 1:50,000 Scales A pocket sized set of 3 UTM
corner rulers or "roamers" for 1:24,000, 1:25,000, and 1:50,000 scale
maps. The 1:24k and 1:25k corners allow you to divide a 1km map grid to
a10m precision. The 1:50k corner allows you to divide a 1km map grid to a
20m precision. Approximate size is 2.75" by 2.75 " (7cm X 7cm).