lactometer

Fig. 17, is a number of glass tubes of equal size, set in a frame called a lactometer or cream guage.

By means of an inexpensive instrument known as a lactometer, this cheat may easily be detected.

Feeling sure that the lactometer must be at fault, I consulted my friend the doctor, who examined and found it quite correct.

With a view to exposing fraud I purchased a lactometer and found the usual proportions of milk and water to be half and half.

The so-called lactometer will show whether the specific gravity is below or above the normal standard.