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This device consists of a kind of ruler and calculator, making various parameters of the reel entered and the calculator calculates an accurate estimate of such parts.
Saves a lot of time compared with other real counters; set, unroll and roll thing of the past. An accurate estimate can give a little aberration, but the cost of 50 or 100 resistors of 1 cent outweigh the cost savings on labor.
And the price is very interesting!