Don't replace your inexpensive scale. Just use it correctly to measure what you're trying to measure.
Like Moonglum, I long ago made a weighing step. My digital scale sits on top of the platter. The weighing step sits on the scale, hangs over the edge, then drops down to a flat step that's at record height. That's what the stylus rests on when I'm measuring downforce.
And yes... 0.33" will make a huge difference with many tonearms.
I made my weighing step by folding/bending a piece of 1" wide copper strip into shape, but any non-magnetic material will do. Cut up credit cards and glue the pieces together... it'll save money!
P.S. Whatever scale or doohickey you choose, don't get the idea it will tell you the optimal downforce for your cartridge. Only your ears can do that. A scale's only use is making sure you're in the ballpark (ie, within the recommended range for your cartridge).