I use both a mailing post scale for all the minute small parts like washers and small screws, etc. It reads grams, ounces much better.
For the larger greasier stuff, I use a small commercial scale that perks all the way up to 60 Lbs.
I am the same when it comes to rulers and tape measures. Micro measuring is the trick.
You would be much better at the job if the old yard stick stayed in the shed.
Bathroom scales do not register well with things that are 20 Lbs and below.
Funny, when people stop by my painting studio, they look over at my scales and mysteriously get quiet in deep thought. I can just see their thought bubbles reading; "AHA, now I know that he must be a Drug Dealer" LOL. Go figure.