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시험관

Scene of a cafe with glasses of iced coffee and test tubes on a wooden stand

aurinko

A blue liquid and a clear liquid in test tubes placed on a marble table

あおねこ

Image of a test tube with a color chart

モノヒョー

Image showing a standard color chart with shades of purple and a test tube

モノヒョー

pH testing kit color chart with test tube

モノヒョー

Standard color chart for nitrate-nitrogen concentration with test tube

モノヒョー

Scene of a cafe with glasses of iced coffee and test tubes on a wooden stand

aurinko

Image of a test tube with a color chart

モノヒョー

pH testing kit color chart with test tube

モノヒョー

A blue liquid and a clear liquid in test tubes placed on a marble table

あおねこ

Image showing a standard color chart with shades of purple and a test tube

モノヒョー

Standard color chart for nitrate-nitrogen concentration with test tube

モノヒョー

Scene of a cafe with glasses of iced coffee and test tubes on a wooden stand

aurinko

Image showing a standard color chart with shades of purple and a test tube

モノヒョー

A blue liquid and a clear liquid in test tubes placed on a marble table

あおねこ

pH testing kit color chart with test tube

モノヒョー

Image of a test tube with a color chart

モノヒョー

Standard color chart for nitrate-nitrogen concentration with test tube

モノヒョー