Extech VFM200 Formaldehyde and TVOC Meter with Temperature and Humidity

The Extech VFM200 is a handheld indoor air quality meter that simultaneously measures formaldehyde (HCHO), total volatile organic compounds (TVOC), temperature, and relative humidity. Its strongest capability is the combination of an electrochemical HCHO sensor and a semiconductor TVOC sensor in one portable device, providing immediate on-site readings for indoor air quality assessments.

Advantages

The VFM200 offers a backlit LCD for clear visibility in dim environments, a fast 1-second sampling rate, and adjustable high/low alarms for HCHO and TVOC. Data hold and min/max reading functions allow easy capture and review of measurements. Auto power off conserves battery life and can be disabled for continuous monitoring. Power is supplied by a 9V battery or the included AC adapter.

Suitable for

• Indoor air quality inspections in homes, offices, and schools
• HVAC system performance verification
• Post-renovation formaldehyde and VOC screening
• Industrial hygiene surveys

Key specifications

• Formaldehyde (HCHO): 0.00 to 5.00 ppm, resolution 0.01 ppm, accuracy ±(5% FS + 0.01 ppm)
• TVOC: 0.00 to 9.99 mg/m³, resolution 0.01 mg/m³, accuracy ±(5% FS + 0.01 mg/m³)
• Temperature: 0 to 50°C (32 to 122°F), accuracy ±1°C (±1.8°F)
• Relative humidity: 10% to 90% RH, accuracy ±5% RH
• Sensor types: electrochemical (HCHO), semiconductor (TVOC)
• Display: backlit LCD
• Sampling rate: 1 second
• Alarm: adjustable high/low for HCHO and TVOC
• Data hold and min/max reading
• Auto power off with disable function
• Power: 9V battery or AC adapter (included)

Recommendations

For accurate indoor air quality measurements, allow the sensor to stabilize for a few minutes after power-on. Use the included AC adapter for continuous monitoring sessions to avoid battery drain.