If you do not have a vial or bottle with a screw cap, and be sure to provide a “blockage guarantee” when transported, for example, acid or antifreeze in the trunk of a car or sunflower oil in a shopping bag, use cord: knotted proposed method, it will securely hold a conventional tube of any vibrations.
Recommend to read
SAFE POWER SUPPLY
The inclusion of transformers on 400 Hz network, 220 V(50 Hz) using a ballast capacitor. If you look at the merits in diversity of industrial and self-made Amateur radio power supplies,...
ELECTRONIC EAR
Check slabovidimym acoustic signals is of great practical importance. This: fault diagnosis of internal combustion engines; search for places of leakage of gas from the damaged pipeline...
