In a test tube small reactions or experiments are performed. There are many different types of tubes. For example some have connectors, some are etched for measurements, some are hardened for durability.
Saio- hodi batean erreakzio edo esperimentu txikiak egiten dira. Hodi mota ezberdin asko dago. Adibidez, batzuk konektoreak dituzte, beste batzuk neurketarako prestatuta daude, eta beste batzuk oso iraunkorrak dira.