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These 50ml glass test tubes are designed for demanding chemical, biological, and microbiological laboratory procedures. Manufactured from high-quality NS-3 glass (GOST 19808-86) and produced according to TU 32.50.50-039-29508133-2023, these tubes meet the stringent requirements of GOST 25336-82 and GOST 23932-90, ensuring reliability and accuracy in your experiments.