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I got an Aprotii "7-in-1" sensor from Amazon UK for about €120 ("currently unavailable"). I haven't seen the same device from other vendors, which is unusual for this type of device on Amazon. Claims to be NDIR, can't seem to open it without trashing the glued down screen cover, so I haven't. I'm no expert on this type of device, I just figured anything less that €50 was going to be pointless. Lots of ventilation holes on 5 sides, a screen you can read from 8m away. Agrees (within tolerance) of a nearby temp/humid sensor. CO2 and VOC are independent. CO2 alone goes up during the day if I don't crack a window, VOC varies with how hot and close beverages are. PMs/VOC are mostly a function of how badly my cooking went in the adjacent kitchen :) I can't be certain about absolute accuracy of values, temp/humid are good, CO2 seems plausible: low is 400ppm, I start to get cranky while working by about 1200ppm. It's wifi (Tuya) if you want, the screen and controls alone are fine though. It also has RS485 and a bunch of relays to drive A/C, Fan, (de)humdifier too. There's a Spanish report that links Kkmoon/Kecheer/Curconsa/Aprotii device vendors: F. Villanueva, E. Jiménez, J. M. Felisi, T. Garrido, J. L. Jiménez, M. Ródenas, and A. Muñoz. Guide about affordable CO2 detectors for COVID-19 Prevention, versión 1.4, 17/04/2021. https://bit.ly/monitorsCO2 HTH. |