Freezing Vials are your best choice for based on the high quality and special features. >Manufactured from durable PP and PE >Aavailable with 4 volumes: 0.5ml, 1.5ml, 2.0ml,5.0ml >Interlocking cap design ensure exact fit and will not absorb water or other contamination >Part of the tube has mold engraved scale experimental process of recording easy >Closures containing silicone gasket can avoid liquid leakage >Screw cap for one-handed operation >Temperature range: -196 ℃ -121 ℃ >Easy-to-read graduations are accurate to ±2% >Sterilized by gamma radiation