High storage safety: the inside forms a closed and isolated space separated from the outside without leakage, favorable for storage and transportation
Memory of use history: the middle cover will be punctured when taking sample out, that is, leave a use mark. This function is to ensure the original fidelity of the sample
Convenient sampling without contamination: the soft rubber sealing layer can be punctured with a pipette tip or a syringe needle. The outer cover won’t be contaminated by the sample, ensuring safety of the personnel and environment