I use the cheap electronic fish scales. I took them to Gander Mountain and talked the gun salesman into letting me weigh several of their guns on their very expensive certified electronic shipping scale and then I would weigh the gun with my fish scales. Within an ounce so close enough for me.
I open the gun and put the hook through the extended extractors. For awhile I used a long string through the trigger guard but my shooting student Joe Wood convinced the the extractors were more than strong enough to hang a seven or eight pound gun. I usually carry my fish scale, wall thickness gauge, and bore diameter gauge to gunshows.
By laying a gun on its side on a table I am also able to use the digitial scale to measure trigger pulls. I get pretty close to the gunsmiths measurement. Some uncertainty in where to put the hook on the trigger and the angle of the scale to the trigger though.
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