Unless you are making large batches, this is more precise and less expensive than the LB-501. Been using it for about a year without any problems at all.

https://www.amazon.com/NEWACALOX-Milligram-Precision-Multifunction-Calibration/dp/B07PRQ85DX?th=1

First link is dead again. I believe I found the same one on Amazon If you could confirm it’s the same that’d be fantastic