I got an eBay direct-from-China "pocket scale" for weighing saltpetre and curing salt for making bacon and ham.
Worked very well, found I was using it for other things (like salt in breadmaking). Coincidentally, all 'white powders' - but not Nigella's recipes!
That scale died after it got wet, without me noticing and suffered lots of corrosion as a result.
Got another, similar styling, same precision, double the range. Price for that model had dropped to the original price I had paid.
New one is fine. Consistent on the 100g check-weight. But unless you keep it on a rock-solid base, out of draughts, the 0.01g digit isn't stable. This is NOT a fault of the scales - rather it is an indication of their sensitivity.
If I have any complaint it is regarding durability. The Tare button sometimes needs 'working' before it works (tarnish on a contact, I'd guess). Durability is maybe expecting too much of a sub-£10 'bargin' that is actually surprisingly accurate.