A test tube rack is used to hold up test tubes. This is so they do not tip over and spill what is in them.
a test tube rock is used to measure liquids
used to chemical test
To hold test tubes. LOL
To hold your test tubes in, or to keep them upright.
Test tube brush=use for cleaning test tubes
Chemists, biologists.
used to hold small amounts of solution.
A test tube brush is a brush that cleans up your test tube when it is wet or messy.A test tube brush is used to easily clean the inside of a test tube.A test tube brush is a couple of wires spun together with bristles on one end in the shape of a test tube. They come in all different sizes and materials for all different size test tubes and uses.
Test tube stands have a very simple use. They are used to hold test tubes during experiments to prevent them from falling over and spilling.
A test tube holder is a device to ...wait for it...hold test tubes ! ;-) Usually a rack or clamp that keeps them upright (& full if in use).
Grethe Rask was born in 1930.
Gertrud Rask died in 1735.