I don’t see why it wouldn’t work. Maybe the build quality isn’t as good as the name brands and it won’t survive 20 years in a lab, but for your use case it should be fine. Order some reference weights while you’re at it and see how good it really is.

But to get accurate measurements (or even be able to properly tare the scales), there are a few things to consider:

Set up the scales on a flat and sturdy surface, the heavier the better (for reference, a proper weighing table is made out of stone). Also make sure there are no drafts from windows, doors, or vents. There should be a spirit level at the back of the instrument. Use that together with the adjustable feet to make sure the scales are perfectly level. Before taring and every measurement, close all of the plastic doors.