... Can be filled with dry nitrogen Laboratory Equipment Vacuum Freeze Dryer Description of Laboratory Vacuum Freeze DryerVacuum freeze-drying technique, ... 3. Imported closed compressor, high reliability, low noise. 4. Cold trap opening big, with samples of pre-freeze function. 5. Cold ... draft tube to improve the effective area of the cold trap, quick drying. 7. Imported inflation valve, rechargeable dry ...