Protractor-Apparent Dip Calculator

Also called Zip A Dip, this 3 in 1 plotting instrument helps to expedite gelogical mapping. The unique design allows for rapid, convenient, and accurate determination of apparent dip and the plotting of directions in a single setting of the instrument. Convenient map scales are printed along the base of the protractor. Features millimeter scale, an inch scale in 1/16ths, an inch scale in 10ths, and a 40 scale. Size is 6 x 3-5/8 inchs.