How much does it weigh?
Reference weights for the things people actually pick up and wonder about. And an Android app that names an object from a photograph and puts a number on it, when the thing you are holding is not on this list.
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Food and produce Groceries are the things people weigh most often, and the ones where a guess goes wrong fastest. A banana and a grapefruit look like the same handful and differ fourfold. Kitchen things Mugs, plates and cups of flour. Half of these numbers are asked because a recipe wants grams and the cupboard only offers a cup. Tools and hardware Weights here spread wider than anywhere else: a lighter and a cordless drill are both held in one hand and differ fiftyfold. Everyday objects Coins, batteries, a phone, a toy brick. Small, familiar, and useful as a size reference when there is nothing else in the frame.