TM 8 DGA With 1 unit calibration gas 35 liters ±2 accuracy Volume @ 500psig max, NIST certified 3 years Expireation Without Regulator 1 unit of Helium Carrier Gas for TM8 w/o regulator Research grade 99.99999%, Moisture 05. Ppm 1 unit of Helium Carrier Gas for TM8 w/o regulator Research grade 99.99999%, Moisture 05. Ppm Show More