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12" Rolling Parallel Ruler
12" Rolling Parallel Ruler
Our Price: $10.35

This handy mapping and drawing tool is ideal for helping you draw
horizontal and vertical lines as well as circles and angles.  The ruler
is 12" (30cm) long, and is graduated in 1/16" (1mm) increments with a
pencil hole every 1/2" (1cm).  The protractor is graduated in 5 degree
increments from 0 to 180 degrees.  The roller is graduated in 1/32"
(1mm) increments and includes various formulas and conversions.  
Dimensions: 13" x 2-1/2" x 3/4".  Shipping weight 1 lb.  Made in Taiwan.
Sand Grain Size Gauge
Sand Grain Size Gauge
Our Price: $18.75

USGS Set Map Rulers
USGS Set Map Rulers
Our Price: $19.00

If you would rather work with just one ruler for a specific map scale,
you will find this set of rulers a great help in plotting and mapping.  
There are ten individual rulers, each marked in minutes, seconds,
decimal minutes, meters/kilometers, and miles.  The following popular
scales are included: 1:24,000 for USGS 7.5 minute topo maps; 1:25,000
for USGS 7.5 minute topo maps; 1:50,000 for USGS County topo maps;
1:62,500 for USGS 15 minute topo maps; 1:63,360 for USGS Alaska 15
minute topo maps; 1:100,000 for USGS and BLM 30x60 minute topo maps;
1:125,000 for USGS regional topo maps; 1:126,720 for USFS forest maps;
1:250,000 for USGS 1x2 degree topo maps; and 1:500,000 for USGS State
and regional maps.  Length of the rulers vary from 5-3/4" to 6-1/2" long
by 1" wide.  Shipping weight for the set is 12 oz.