Having a balance scale to check your digital scale is nice, but not necessary. The digital scale comes with one or more check weights. Before I weigh anything with my scale, I toss on a quality bullet of known weight like a 180 grain Accubond. If the scale were actually off by one grain on a 60 grain powder load, it would be off by three grains on the 180 grain bullet which would be very noticeable. If the scale is in error, it would generally be way off.
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