Follow the instructions listed below: For rough measurements, where the accuracy only needs to be to the closest degree, use the 0-mark on the upper scale to find the angle reading on the lower scale. The lower scale is marked in 1-degree increments. In more critical applications, if the 0-mark on the upper scale falls somewhere between two marks on the lower scale, the user may want to know the exact angle in terms of degrees and arc-minutes: The degrees reading is still obtained from the lower ring The arc-minutes reading is obtained by looking at the upper ring, and finding which upper-ring mark lines up exactly with a lower ring mark. Whichever upper-ring mark lines up the best is the number of arc-minutes to add to the degrees reading from the lower ring.> Note that the upper ring markings are in 5 arc-minute increments. That is the finest resolution possible with this product. You can also refer to the attached document for further information on how to read the scales.
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