What to look for in a kitchen scale I'm thinking of buying a modern, probably electronic kitchen scale, to replace my really ancient mechanical one. I'm located in Bombay, India.

I'm wondering what considerations should inform my decision. Possible points include:


Should the scale be waterproof? Is that a useful feature?
On a related note, what considerations should one give to being easy to clean?
Apparently if the tare button is on the weighing surface, it can distort/bias the weight measurement by a few grams. It's not necessarily clear for a given item whether that will be a problem or not. It's presumably only an issue if the weighing is very fast.
Should there be a platform for weighing, which is separate from the main machine? See the previous point. Also, if it's the same platform, then whatever you want to weight may block the display. Though some units, like the Soehnle Page Profi (see below) have a hold button to deal with that.


I'm currently considering Soehnle, specifically
Soehnle KSD Page Digital Kitchen Scale and 
Soehnle KSD Fiesta Digital Kitchen Scale. Though the former appears to actually be the Page Profi. "KSD Page" has no hits elsewhere.
America's Test Kitchen did a segment on digital kitchen scales. Their judging criteria were:


Accuracy: Does the scale display the correct weight?
Button usability: Are the buttons in an accessible location? Can they be pressed without too much force?
Display visibility: Can you see the display when a large bowl is on the scale? Are the numbers large enough to read clearly?
Easy to clean
Stability: When you push the buttons, does the scale move?


To answer your specific questions:


None of the 10 scales they tested were waterproof - it seems like that may be a rare feature.
If you can detach the weighing platform from the rest of the scale, it will be easy to clean.
They did not have problems with the tare button biasing the weight.
A weighing platform separate from the main machine makes it easier to see the display and press the buttons, even when a large bowl is on the scale.