Another option for scales, I have this one. It goes to 50 pounds and I've confirmed several times that it weighs exactly the same, down to the tenth-ounce level, as my local post office's scale.
https://www.amazon.com/ACCUTECK-W-8250-50bs-Digital-Adapter-Silver/dp/B00SMHWZ42/ref=sr_1_1?crid=2BTG060LP2ZX4&keywords=accutek+shipping+scale&qid=1684709760&s=office-products&sprefix=accutek,office-products,149&sr=1-1
https://www.amazon.com/ACCUTECK-W-8250-50bs-Digital-Adapter-Silver/dp/B00SMHWZ42/ref=sr_1_1?crid=2BTG060LP2ZX4&keywords=accutek+shipping+scale&qid=1684709760&s=office-products&sprefix=accutek,office-products,149&sr=1-1