Ranges and Accuracy

Indicator	Range	Resolution	Error
PM2.5/PM10	0–999 μg/m³	1	±10 μg/m³
Formaldehyde (HCHO)	0–3.00 mg/m³	0.01	Less than ±0.02 mg/m³
TVOC	0–2.00 mg/m³	0.01	±0.1 mg/m³
CO₂	350–5000 ppm	1	±50 ppm
Temperature	-25 to 85 °C	—	±1.0 °C
Humidity	0–99 %RH	—	±8 %RH

Comparison tests

The channels above have been compared with the following professional instruments. These tests evaluate trend consistency and tracking error; they do not claim equivalent accuracy.

Channel	Reference instrument	Test observation
PM2.5	TSI DustTrak II 8530	High trend consistency in the cigarette-smoke challenge test
CO₂	FLUKE 975 professional gas analyzer	Tracking error remained controlled across the full range
Formaldehyde (HCHO)	InterScan 4610	Direct pure-formaldehyde comparison; mixed-TVOC calibration in household scenarios removes cross-interference
TVOC	RAE3000 ppb-level VOC monitor	Trend comparison across the 0–2 mg/m³ range

2.4-inch high-definition display

The device displays all seven indicators in real time. It supports Chinese and English, six-channel particle counting, a 32-minute concentration graph, and local recording to a TF card.

Indoor air quality reference standard GB/T 18883-2002

Readings are grouped according to the following reference levels (Excellent / Good / Moderate / Poor / Hazardous):

Indicator	Excellent	Good	Moderate	Poor	Hazardous	Unit
PM2.5	10	30	50	100	300+	μg/m³
Formaldehyde	0.01	0.05	0.08	0.10	0.3	mg/m³
TVOC	0.20	0.40	0.60	1.5	3.0	mg/m³
CO₂	450	750	1000	1500	3000	ppm