Glassware Burets Flasks & Beakers Pipets Volumetric Flasks & Graduated Cylinders Tools Test Tubes Instruments Analytical Balance pH Meter: Digital Spectrometer: Digital Techniques Flame Tests Pipetting Proper Weighing Technique Titration Vacuum Filtration Lab Manual Home		Test Tubes A Test Tube is small non-volumetric container used to observe small volumes of reactants. Using a Test Tube Adding solutions to a Test Tube. Mixing in a test tube. In order to "stir" substances inside of a test tube, hold the tube gently but firmly between the thumb and forefinger of one hand and gently "thump" the bottom of the tube with the middle and forefiinger of the other hand. Be careful not to slosh the contents out of the tube.