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Portable refractometer with easy to read viewer, a scratch resistant lens and a rugged metal case. Measures refractive index (RI) from 1.3 to 1.8. Eye piece15mm. Polarizing filter. Battery powered sealed internal light source. On/Off Button for the light. Light source is white with a filter to make the lightwave 589.3nm. Wavelength filter on light source produces a crisp clear line on refractive index scale. The Refractometer was tested for calibration at the factory,.
Includes ♦ protective carrying case ♦ refractive index liquid. 1.3-1.8 RI 10g ♦ Minimum division: 0.01 ♦ Accuracy +/- 0.02 ♦ Size: 115 x 35 x 63 mm ♦ Weight: 12 oz (about 336g) ♦ Power Source: 3 1.5v batteries.
Made in China (as are most, even if someone puts a different label on it.)
Batteries (not included): LR44 button. Energizer 357 is one brand name.
BONUS (Copyright IGS). 'HOW TO USE A REFRACTOMETER' ( my original download). (MSWord). To your email.
The product had no instructions whatsoever, not even in Chinese!