PerfectPrime AQ9600

It's difficult to rate a device, the accuracy of which cannot be easily checked. The Amazon ad states accuracy of 10%, but the handbook supplied gives 20%. I wanted the meter to compare different environments and effectiveness of filters. For that reason absolute accuracy is not so important. I'd be more than happy if the device was anything like 20% accurate. To test if it was giving anything like reasonable readings I used cigarette smoke from a single cigarette in a sealed room. Fine particulates (0.3um to 0.1um) from cigarettes is well documented. I found number of particulates to be within a factor of two of the theoretical level. Given the various uncertainties in such a crude experiment, I see that result as very satisfactory. On the negative side the accompanying manual is clearly translated from Chinese, and is very unclear in places. The section on "calibration" is, to my mind, totally unintelligible. Some other items in the Amazon ad don't seem to make sense; the sampling time is fixed, not variable as stated. Charging can be by the supplied transformer (American plug) as well as USB. Manual says 999 samples can be stored, not 2000 as in the ad. I have "played with" several of these relatively cheap particle counters and I have to say I have the greatest confidence in this one. To have high confidence you have to spend well over a thousand pounds on a device, so if you're looking for a decent affordable device for comparative home use then this should fit the bill.

Nonostante il costo decisamente economico, il prodotto è di ottima qualità e svolge correttamente il suo lavoro. Anche la precisione non è male… Abbiamo eseguito prove di comparazione.

Ich habe kein Teures Marken Vergleichsgerät um die Angaben zu überprüfen ob sie stimmen. Brauche es in erster Linie für mein Luftreiniger daheim um den Filterwechsel rechtzeitig vorzunehmen, und da liefert er mir gute Dienste.

Accurately detects dust and debris in the air from smoke, cigarettes, pollen, and fire. The charger that comes with it is questionable but works and the interface takes some getting used to but is usable. The internals of this device are a bit of a mess and i founds bits of loose solder inside that i cleaned out.

Ottimo

Unit worked first couple of times I tried it... and never again. Now readings all zeros. Sample fan runs for 38 of the 50 second sample interval; then stops. Readings all show zero. History shows 11 runs, first 8 or so before I received the unit, all numbers in the 35 to 50 range. After receipt the numbers were low, 6 to 8 for two readings, now zeros. Unit falsely advertises it has HCHO measurements (formaldehyde) - it doesn't. Third imported/no-name air test device that failed to work at all or as advertised. So I am done with imported junk. Unless a seller has a US storefront I can walk into, or an office I can visit, my dollar will stay in my pocket.