A traditional handheld refractometer is a type of refractometer, measuring refractive index that works on the critical angle principle. They are still used today as an inexpensive alternative to digital laboratory refractometers. It utilizes lenses and prisms to project a shadow line onto a small glass reticle inside the instrument, which is then viewed by the user through a magnifying eyepiece.

These instruments may have calibrated reticules that offer readability in units that include refractive index, Brix and other qualified units of measure that include clinical and chemical technologies.

There have been many refinements regarding ease of use and precision to these instruments over the decades which have culminated in the development of the current Master Series which fulfil the requirement of users.

Features(MASTER-α)

Measuring Method

1) Apply 2-3 drops onto the prism surface.	2) Close the daylight plate.	3) Look through the eyepiece. Read the boundary line where the blue and the white color meet. This is the Brix(%)

Maintenance

• After measuring, use a lint-free tissue to wipe the sample off of the prism surface. If the sample contains oils or fat, use isopropyl alcohol and water to clean the prism surface.

• When not in use, keep the refractometer in the storage case at room temperature (20°C). Avoid storing the unit in direct sunlight or in a moist environment and do not subject the unit to strong shocks or vibrations. The ambient temperature at which you can safely store the units is between 0 and 40°C.