Just zero the scales. Then use a weight to check . The weight should be within the scope of what u weigh. Say from 55 to 180 gr. Any weight will do. I use a ss bolt. Consistanccy is what matters for us.
The greatest invention in the history of man is beer. https://youtu.be/2v3QrUvYj-Y Member. SFFP, Shooters Union. SSAA, the powerful gun lobby. Hunt safe.