Other than having it certified is they anyway to measure a spring scale to make sure it is reading the correct weight using items at home??
2 liter bottle of soda. Density of water is 1 gm per cc, so 1000 cc = 1 liter = 1 kg. 2 liters of water/soda should weight 2 kg = 4.41 lbs. So, 14 two-liter bottles of soda will be 28 kg = 61.7 lbs (if we ignore the plastic bottle weight). So, 16 two-liter bottles of soda will be 32 kg = 70.6 lbs. I use paracord and tie two bottles together. Then, I attach the pair of two liter bottles of soda to the spring scale.Other than having it certified is they anyway to measure a spring scale to make sure it is reading the correct weight using items at home??
I should be able to get a hold of that from a few friends,Shot for reloading shotgun shells is sold in 25 pound bags. Given the picky nature of skeet and trap shooters, you can likely be confident that a 25 pound bag of target grade 7.5 shot will be exactly 25 pounds.
That's what I would use......you can get weights cheap at Play it again sports, garage sales etc....or barrow some from a friend. I have used the weights with holes (for bar bells) because they are easier to hang. Even they are not perfect but plenty close for what you are doing.Tie some dumbbells together and hang them on the scale
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that's kind of what I did, I had to get water today anyway, so I measured 2 5 gallon jugs. both came out to 41 lbs on my digital bathroom scale, tied together they had an average 82 on my spring scale, so I will go with it is close LOL1 liquid gallon of pure water weighs approx 8.3 lbs at 62 degrees F. Using a combination of containers and a fairly accurate measuring device for the water you should be able to get very close to the target weight you are wanting to measure on the spring scale.
For instance, 2 gals of water will weigh about 17.7 lbs if wanting to check amount of holding weight on a 70lb/75% let off bow (17.5 lbs).
8 gals of water weighs about 66.6 lbs, which if the scale is accurate there, it probably also will be around 70 lbs for draw weight.
If using 2 liter bottles, measure the water that you put into the bottle and then mark a line on the bottle where it is exactly 2 liters. Don't just fill it full and assume that it is right. Same with "gallon" containers. Some gallon containers have "dry" gallons marked on them. A liquid gallon is 231 cubic inches which is 8.3 lbs of water. A dry gallon is 1/8 bushel, or about 269 cubic inches so if filled with water would weigh about 9.7 lbs.
On a large container like a 5 gal bucket, it would be best to weigh the bucket to get a close reading on its additional weight. For instance, a 5 gallon utility bucket from Lowes weighs a little over 1 3/4 lbs.