Drager Pac Ex2 Methane Gas Detector 8316107 & Charger Cradle 8318090

Description

Up for sale is a
Drager Pac Ex2 Gas Detector 8316107
&
Charging Cradle 8318090
.   Used surplus equipment.
The unit does charge up and power up, but the battery longevity has not been tested nor guaranteed.
When I turn it on, it runs through a short series of self-checks I think and flashes
ERR
.  I assume that means it may not be calibrated or something.
The sticker on the outside says Methan/Methane as you can see.  That may not be the only gas it tests for.  I don't have the knowledge about this model.
I do remember seeing O2% in there.  Oxygen.
See actual photos of what you get.  Good clean condition.
Contents of Sale:
Drager Pac Ex2 gas detector,      Part#
8316107
Drager Pac Ex2 Charging Cradle,  Part#
8318090
FW7207/11A04 AC/DC Adapter for the battery charger.