RAE Systems QRAE 3 Four Gas Monitor MODEL# PGM-2500, PGM-2560 Provides monitoring of Oxygen (O2), Combustibles (LEL), and toxic gases. Toxic gas options include Hydrogen Sulfide (H2S), Carbon Monoxide (CO), Sulfur Dioxide (SO2) and Hydrogen Cyanide (HCN). Available in Diffusion or Pumped version. Continuous datalogging (3 months for 4 sensors at 1-minute intervals, 24/7) Easy access to pump, sensors, filter and battery compartment. Quote View Details Quote Request