Review on 🌬️ Optimized Air Quality Particle/Dust Detector/Counter - PerfectPrime AQ9600, PM 0.3/2.5/10 Μm by Sam Faucher

The device worked the first few times I tried it. and never again. Now all readings are zero. The sampling fan runs 38 of the 50 seconds of the sampling interval; then stop. All readings show zero. The history shows 11 runs, the first 8 or so before I received the device, all numbers ranging from 35 to 50. Upon receipt the numbers were low, 6 to 8 for two readings, now zeros. The device falsely advertises that it has HCHO (formaldehyde) measurements - it doesn't. Third imported/unnamed air test device not working at all or as advertised. So the imported garbage is over. If the seller doesn't have a US store I can go to or an office I can visit, my dollar stays in my pocket.