Portable air quality meter | HCHO / TVOC concentration measurement | rechargeable battery | audible and visual alarm

Technical Specifications

Type: Portable gas detector
Model: DT-900A
Brand: GOYOJO
Country of origin: China
Housing: ABS plastic
Power supply: 7.4 V rechargeable battery
Auto power-off: Yes

Formaldehyde (HCHO)
Measurement range: 0.00 – 5.00 mg/m³
Resolution: 0.01 mg/m³
Repeatability accuracy: ±2 %

TVOC (Total Volatile Organic Compounds)
Measurement range: 0.00 – 9.99 mg/m³
Resolution: 0.01 mg/m³
Repeatability accuracy: ±2 %

Operating temperature: 0 °C ~ +50 °C
Storage temperature: –10 °C ~ +60 °C

Functions

Measurement of formaldehyde and TVOC concentration
Indoor air pollution level assessment
Visual (analog bar) and audible alarm
Fast response and stable readings
Suitable for continuous or periodic indoor monitoring

Usage

For home users: Air quality checks in houses and apartments, children’s rooms, after renovation, painting, laminate or furniture installation, testing new furniture, toys or carpets, creating a healthier living environment
For electricians / installers: Assessment of indoor air conditions at customer premises, verification of ventilation efficiency, added value to services (air quality monitoring)
For engineers / construction professionals: Indoor air quality (IAQ) assessment in projects, during building commissioning or renovation, monitoring of offices, schools and public facilities

Pros

Real-time measurement
Accurate and stable readings
Clear audible and visual alerts
Compact, portable design
Rechargeable battery – no disposable batteries required
Suitable for residential and professional use

Cons

Does not measure CO₂ or particulate matter (PM2.5 / PM10)
Designed for indoor air monitoring only