The West Advisor
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Comments about Bi Rola Rule Rolling Plotter:
I was looking for a faster/easier method for plotting than using the ol' parallel rules. This was NOT the answer. No matter how I held the device (at first, I followed the directions exactly), while rolling it along the chart, it did not always roll true. I ran test after test and compared the results to my parallel rules. This device failed time after time and without any warning, as you won't even notice as you are rolling it that it is going off.