If you want a really precise scale for reloading, weighing single kernels. The A&D FX120i is excellent, and as cheap as i would go.
The Gempro can not accurately and reliably measure this, but the price should give a good pointer to that in the first place.
Some seem to work fine, others have repeatability issues, easily affected by RF noise, and tend to drift quite a bit.
A strain gauge scale is just not accurate enough for such a task.
But these are quite popular still and is more accurate then the normal electronic reloading scales from RCBS, Pact, Lyman etc.