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Alva 20-Hole Kjeldahl Nitrogen Tube Bracket for Standard Narrow-Mouth/Wide-Mouth Kjeldahl Digestion Tubes, Find Details and Price about Test Tube Rack Laboratory Instrument from Alva 20-Hole Kjeldahl Nitrogen Tube Bracket for Standard Narrow-Mouth/Wide-Mouth Kjeldahl Digestion Tubes - Jinan Alva Instrument Co., Ltd.