I've got a 2-gas exhaust gas analyzer made by Peerless Instrument Co, Chicago, Model 630. No manual, and Google has come up with nothing except a false trail to Curtisswright. And 'phone calls to analyzer spares firms, here in the UK have similarly drawn a blank.
Can anyone help either with a manual or some info on this bit of kit, which I think dates back to the 1990s? It's a 12V portable CO and HC machine.