Q.

[[1]] is used to check the purity of milk.


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Detailed Solution

Lactometer is used to check the purity of milk.
The lactometer is used to measure the purity of milk. It is graduated into 100 subparts. The richness of milk is determined by the deposited layer of the cream at the bottom of the lactometer. It checks the density of milk and calculates its richness. That's why it's called a lactometer.
 
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[[1]] is used to check the purity of milk.