All three units show substantial scratches, scuffs, dirt and installation wear. Revision, serial number, filter fitting and tubing configuration vary between the photographed units. Wiring is exposed at the top connectors. The purchaser receives one unit selected from the available photographed stock. Includes x1 Honeywell MDA Scientific MIDAS-T-OOP pyrolyzer module with the attached Honeywell filter and tubing fitted to the selected photographed unit