In gemology a different type of refractometer is used to measure index of refraction and birefringence of gemstones.
12.
Digital refractometers also find the critical angle, but the light path is entirely internal to the prism.
13.
Gemstone refractometers are available both as classic optical instruments and as electronic measurement devices with a digital display.
14.
When using a refractometer, one should report the result as " refractometric dried substance " ( RDS ).
15.
A few grapes are crushed between the fingers and the must is dripped onto the glass of the refractometer.
16.
Calibration is usually based on the ICUMSA tables, but the user of an electronic refractometer should verify this.
17.
Digital handheld refractometers are generally more precise than traditional handheld refractometers, but less precise than most benchtop refractometers.
18.
Digital handheld refractometers are generally more precise than traditional handheld refractometers, but less precise than most benchtop refractometers.
19.
Digital handheld refractometers are generally more precise than traditional handheld refractometers, but less precise than most benchtop refractometers.
20.
Some modern Abbe refractometers use a digital display for measurement, eliminating the need for discerning between small graduations.
