Justin Scholz
Jon Worth@jmovs Ah! Just been writing about this! https://jonworth.eu/if-covid-is-now-endemic-its-time-to-discuss-permanent-changes-to-the-way-we-behave-like-wear-a-mask-zones-on-long-distance-trains/
If COVID is now endemic, it's time to discuss permanent changes to the way we behave - like wear-a-mask zones on long distance trains - Jon Worth Euroblog
Christian Drosten has today stated that the COVID pandemic is over, and the virus is now endemic. That has led, rather predictably, to the demand that all Corona protection measures be lifted in Germany – FDP Justice Minister Buschmann was the swiftest to make this demand today. But that COVID […]
Pepijn
Dominik
@DominikTo @Pepijn @jmovs Yes. It costs considerably more. I checked it when I bought the Protmex - I don't need the extra accuracy, or the data to be downloadable. If you do I am sure it's ace.
@DominikTo @jon @jmovs We use a couple of these at work to monitor some special rooms. Well designed but somewhat expensive if you're not interested in the logging functionality.
Everton Zanella Alvarenga@jon @DominikTo @Pepijn @jmovs
I've bought this one from Dostmann, €70. It seems reliable, and I can read the data on my computer via USB. I also bought a UBB-c to micro USB cable to measure the CO2 level outside. The CO2 level was okay on an ICE to Hamburg last weekend.
@jon @DominikTo @Pepijn @jmovs
The train was coming from Munich to Hamburg. At the central station, in Berlin, while the doors were open for a few minutes, it dropped to around 500 ppm, which is quite good. After around 1,5h, it increased to 936 ppm. I think we had around 33% of occupation on my wagon.
There is some air circulation, but it should be better. Once, my train go stuck and was almost full. The Co2 level almost reached 3000 ppm.
@me @DominikTo @Pepijn @jmovs That's the other decent one in the budget price range - can download data, but it has no battery inside it AFAIK.
@jon @DominikTo @Pepijn @jmovs
Indeed, it has no battery. But I can connect it to my mobile with a cable like this one (it costs less than €6), so I can measure in public places.
@jon @DominikTo @Pepijn @jmovs
A few months ago, I measured how much the CO2 level increased in my living room (circa 55 m³) after an online meeting of about 2h30. I was alone, and all doors closed. The CO2 level dropped quickly after opening the door to the balcony.
Idealistic Pragmatist 
@jon @me @DominikTo @Pepijn @jmovs it’s actually really useful! I bought my Aranet4 back when there weren’t any other options, but honestly I’d still go that way now, I think.
Tom Tom