The Extech FM200 is a handheld Formaldehyde Meter with a detachable probe. This meter simultaneously displays formaldehyde (CH₂O) concentration, air temperature, and relative humidity readings on a large, LCD backlit display. Specification: Formaldehyde :0.00 to 5.00ppm Formaldehyde Basic Accuracy: ±5% Formaldehyde Max Resolution: 0.01ppm Relative Humidity: 10 to 90% Relative Humidity Basic Accuracy: ±5% Relative Humidity Max Resolution: 0.10% Temperature (Air): 32 to 122°F (0 to 50°C) Temperature (Air) Basic Accuracy: ±2°F/1°C Temperature (Air) Max Resolution: 0.1°F/°C