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Traditional Refractometer
Digital Refractometer
Gemological Instrument
Scientific Instrument
Bench type digital refractometer
[2006-5-21]
Gem Instrument
[2006-5-21]
Pocket type digital refractometer
[2006-5-21]
10X loupe with built-in light source
[2006-5-21]
pocket digital gem gauge
[2006-8-26]
portable dial gem gauge
[2006-8-27]
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