Hello -
What maximum weight do you think you'll need to cover? There are commercial grade digital scales that can handle up to 10 lbs. The one I own can measure in either lbs/ounces or kilos/grams, and tares easily. It's all metal construction, easy to clean, and runs on house current or a nine volt battery. Regrettably, I'm blanking out on the brand name, and it wasn't cheap {$250-$300}, but it's been indestructable for me. I'll rustle up the brand name.