Weigh yourself on a scale then jump on again while holding a piece of rock. Unless they are smaller pieces, then a borrow/buy a kitchen or even postal scale.
get a fish scale, digital is better here. hang it up somewhere. place an empty 5 gal bucket on it. turn it on. the scale should read 0lbs, if not tare the scale(most have a button labeled tare which makes it reset to 0). then add the rock. it works great. just make sure you put the bucket on and set the scale to 0lbs so you dont include the buckets weight.
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