Really sound like you need a scale.
BDS had a good thread on Myth busting Digital scale here, might want to take a look at it.
Lots of scale reviews here as well
I have 3 different scales, a GEM20 (weighs tiny amount well, accurate to .015gr) sensitive to air, small pan, use it every now and then.
A RCBS 5-0-5 beam reloading scale, acurate to .1gr, use it when I am trickling charges and as a check of either of the other two.
Frankford DS750 about $27, accurate to .1 gr, what I use most often when checking pistol charges. (need to make sure it has good batteries)
Available lots of places, "reloading scale"
Check weights-you need some.
https://www.amazon.com/American-Wei...&qid=1516845408&sr=1-1&keywords=check+weights
Some inexpensive ones with weights in the range you would use for pistol charges.(and heavier) $12
Note on the check weights
Weights are class M2 (there are better, more expensive ones)
Allowed tolerance on a 100mg (1.5432gr) M2 weight is 1.6mg or .02gr, (hope I got my math right here, g=grams, mg = milligrams, gr = grains, powder is weighed in gr)
M2 Allowed 5mg on 5g or about .08gr on a 77gr weight (still less than .1 but starting to get to be more of a concern at the heavier end of the range)
Accurate enough IMO.
https://www.oiml.org/en/files/pdf_r/r111-1-e04.pdf
(M1 is better, F classes better still, E class better than F, more accurate = more $)
So allowance on a 100mg 1.54 gr M2 weight would be 1.52-1.56gr, not perfect and there are better for more $ but close enough as most reloading scales accuracy is .1gr.
Ok after the bla bla above, the important thing is
get a good scale and a scale calibration weight that is say 50g does not tell you if the scale is weighing 5gr charges correctly.