A quadruple-beam balance is a handy laboratory tool to have when you need to weigh small items to a hundredth-gram precision. The beams are horizontal metal rails that hold sliding counterweights, starting with 100 grams and going down to a tenth-gram. The first beam is furthest back from the user; it holds the 100-gram mass, the second is closer, having the 10-gram, and so on. The tenth-gram beam is marked in .01-gram increments. An adjustable weighted screw on the left lets you precisely zero the scale. On the right is a tilting indicator. It’s vertically centered when the scale’s in balance, otherwise it’s over-or under-balanced.
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