I bought a CJ-4000 digital scale a local espresso bar uses to weigh each shot. (They had one for sale on the shelf for about a year.) 4000 gram capacity to half a gram. Obviously meant to be used it it can weigh the grind for every shot the baristas pour.

I used it to pack for Cxyle Oregon. (60 pound max, one bag). Made a spreadsheet of all items. (Actually did that years ago and just added a column for the weights.) Final bag checked within a pound of the calculated as weighed by a bathroom scale.

In real life, the scale gets far more use weighing coffee beans. But it is easy to use, easy to keep the tray clean, measures in grams, ounces and pounds, easily zeros containers and will count parts (like ball bearings). $35 but a purchase that makes my life better.

Edit: NOT accurate enough for drugs, a real plus.

Ben