Too late for you, but here are my observations. I have a Kern counting scale, which I'm satisfied of, but with my experience with it, I might choose another model now:
- 0.1g is too coarse for electronics, imo. As noted, you want several counts resolution, the more the better. My scale has 0.01g resolution, and it is still not enough for smallest parts I use. I can happily live with that, as I use the scale for mechanical parts. For example, a M3 washer weights about 0.07g. I have no issue bagging some extra, as they cost 0.0x cents each. But electronics parts with similar size can cost several €/$'s.
- You really want a display for count and the ability to zero out a container. It is time saving to be able to put in a known count; fixed 25 pieces sounds like a lot. It might be ok though, I haven't tried. If I need a reference for 50, I put in ten, pour in 50 and set it again.
- Calibration weights are (very) expensive, but you don't need calibration nor absolute accuracy for parts count. You don't care if your scale says the part weights 1.000g but in reality it weights 1.003g. However, you do want to know that when your scale measures 234g and shows 234 pieces, there really are 234 pieces. In other words, you want very good linearity.
- My scale has memory function, I can put in 30 parts and their reference weights. However, without a computer or computer-like interface, that is more hassle than it is worth. Besides, the scale drifts. If I weighted a part a few months back, today it might be off for one piece per 50. I don't know if the scale drifts or if the environment (like air pressure) changes cause that. These together cause me to count ten pieces before starting weighting. Does not really add up, as I fill few ten bags per part at a time. I don't miss the memories.
- If you plan to use it much, you want to use a low profile scale. Mine is uncomfortable high in relation to the table top where all the other stuff is. I don't want to use it the whole day.