391 Orsat Gas Analysis Apparatus 4 Test "PSAW" With Palladium / Platinum asbestos tube similar to Cat. No. 383 in design but with four absorption pipettes and a palladium / platinum asbestos tube. This is for the analysis of CO2, CO, O2, H2 and nitrogen (By difference). Comprising of leveling bottle. 100 ml. gas burette with outer jacket, four absorption pipettes, tube, adjustable spirit lamp and 4 test PTFE (Teflon) Key stopcock manifold in wooden case with sliding doors