it is neither cheap nor more durable than other
equipment in the quality surveillance laboratory. This
little instrument costs about 0, and the plastic can be
scratched. Be careful when it is in use or in storage.
The name refractometer tells you how it works. By
the prism on the front (fig. 3-11), light is refracted
through the sample being tested onto the scale inside the
Figure 3-10.Equipment in a refractometer kit.
Figure 3-11.Refractometer (top view).