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Range: 0.0-95.0%, 1.3000-1.7000
This is an older refractometer that appears to differ from the current generation mainly in interface and temperature sensing technology. It requires you write down what you see on an illuminated (green) scale and read a glass mercury thermometer. It uses a 115 VAC powered 8 watt light source which in good condition.
The instrument's movements are all smooth. There is some paint failure and superficial rust on the base. There is no model information on the instrument. The serial # is 99890. After contacting atago-usa.com, I believe it is an early version of the 1-NAR series
These are used to measure the refractive index (nD) and are used in analysis of liquids, glass, plastic and film.
Operation consists of placing a sample on the prism; while looking through the eyepiece, the control knob is turned until the shadowing is centered in the crosshairs (see image); the reading is taken where the vertical line crosses the scale. Calibrate with water.
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