Description:10Pcs/Set 5ml 10ml 20ml 25ml 50ml Glass Clear Graduated Test Tube Used for Laboratory Test Specification:Material: GlassColor: ClearCapacity:5ml/10ml/20ml/25ml/50mlQuantity: 10Pcs/Set Features:1. Various Sizes make it accessible for you to choose the proper test tube according to what you need.2. It is commonly used as a reaction container for small amounts of reagents in labs experiment at room temperature or heating.3. Stable material produces clear lines, bright and unchanged color.4. The measurement result can be read directly for the substances generated after the reaction with clear calibration and reduce the errors caused by transfer procedures. Notice:1. You are supposed to preheat the test tube before heating, otherwise it will tend to burst. 2. No more than 1/2 of the test tube capacity is filled with solution and no more than 1/3 of the test tube capacity is heated.3. The dropper should be kept in a certain distance with test tube when dropping liquid into the test tube with a dropper, extending into the mouth of the test tube prohibited.4. The test tube cannot be washed immediately after heating until it is cooled to room temperature. Package Included:1 x 10Pcs/Set Test Tube More Details: