Very cool, to encounter some familiar devices, far away in the hands of Dave the crazy aussi bloke...
By chance I happen to be an electronic engineering student, working at Dräger in Lübeck.
I'm working there as a "dualer-student" (something like dual course of studies in english) which means that im studying normally, and then, in each term break I get to work in one of Drägers different departments.
From the end of January on I'm going to spend some weeks in the "portable gas detection instruments" department, where I for sure will encounter the followup-modell of your Multiwarn - which by the way in deed is outdated and yes!, quite expensive when it comes to repair or replacement parts.
There is a widespread range of instruments for mobile (and as well stationary) gas detection of which many can easily cost 1000+ bucks.
Maybe you're interested to know, that those instruments are assembled in Lübeck, and the electrochemical gas-detection sensors you will encounter during the teardown (and you already saw under that NOT rotating cover
) are developed and produced by Dräger in Lübeck as well.
Looking forward to the teardown and Daves opinion on our high quality gas detection instruments!