I have just bought aranet4, a CO2 meter, which uses eink and I think partly because of that has a ridiculously long 5 year battery life. But I understand why…

I have just bought aranet4, a CO2 meter, which uses eink and I think partly because of that has a ridiculously long 5 year battery life. But I understand why… it’s 169eur, the cheaper CO2 meters are just much cheaper.