Test tubes are universal cylindrical laboratory glassware with a round bottom that are used e.g. for chemical reactions, pretreatments or for storing small amounts of liquid.– Thin-walled and therefore resistant to rapid temperature changes or localized heating – Easier pouring due to beaded rim – Fired-on, highly durable white ceramic – – Test tubes are universal cylindrical laboratory glassware with a round bottom that are used e.g. for chemical reactions, pretreatments or for storing small amounts of liquid.– Thin-walled and therefore resistant to rapid temperature changes or localized heating – Easier pouring due to beaded rim – Fired-on, highly durable white ceramic – –