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Some balances weigh in different resolutions (minimum weight) over different ranges. For instance, it might weigh in 0.1 steps up to 1000g, and then it will weigh in 0.5g steps up to 3000g, and then it will weight in 1g steps up to 5000g. These days this all happens automatically, the resolution automatically changes as the weight gets higher, you don't have to press any buttons.
This gives the best of all worlds, you can weigh gold down to, say, 0.1g and silver all the way up to, say, 5000g.
Q. Why so complicated, why can't they just make a scale that goes in 0.1g steps up to 5000g?
A. That's not a problem, there are plenty like that, but they cost a few hundred pounds.
Confused about weights? 1g? 0.1g? 0.01g?, 0.001g ? See our article about weighing.