Features:

With bright backlight, it is convenient to use at night.
Temperature can be displayed in Celsius(°C) or Fahrenheit(°F).
With a removable base, the meter can be placed on the table.
With a high precision sensor, the detector has the advantages of high accuracy, stable, real-time continuous monitoring.
The detector can give an alarm every 5s for fair level and every 1s for bad level to remind you of opening the window for a change of air.Specifications:

Display: LCD Display
Backlight: Green
Formaldehyde Measuring Range: 0-5PPM
Formaldehyde Resolution: 0.01PPM
Formaldehyde Accuracy: ±5%
Formaldehyde Level: <0.1mg/m^3 Good; 0.1-0.3mg/m^3 Fair; >0.3mg/m^3 Bad
Temperature Measuring Range: 0-40°C / 32-104°F
Temperature Resolution: 0.1°C / 0.1°F
Temperature Accuracy: ±2°C
Humidity Measuring Range: 10-95%RH
Humidity Resolution: 0.1%RH
Humidity Accuracy: ±5%RH