Features:
1. Dual Beam NDIR (Non-Dispersive-Infrared) technology is used to improve the long term stability
2. CO2/Temperature/RH Monitor; Tracer
3. Chart with variable time Zoom Levels
4. Build-In Plant Types Directory
5. 3-color LED (green / yellow / red) gradually changes color with CO2 concentration
6. Foolproof "Hold Home" function
7. CRR, CO2 Replenish Reminder

Specifications:
1. CO2 Measurement:
1)CO2 Range: 0~5000ppm
2)Sensor Type: Dual-Beam NDIR
3)Accuracy at 0~3000ppm: ±50ppm or ±5% of reading, whichever is greater; Accuracy over 3000ppm ±7%
4)Repeatability: 20ppm at 400ppm (standard dev. of 10 readings in 1 minute)
5)Display resolution: 1ppm (0~1000); 5ppm (1000~2000); 10ppm (>2000)
6)Temp dependence: ±0.1% of reading per °C or ±2ppm per °C, whichever is greater, referenced to 25°C
7)Pressure dependence: 0.13% of reading per mmHg (corrected by user's altitude input)
8)Response time:
9)Warm-up time:
2. Temp Measurement:
1)Operating Temperature: 32°F to 122°F; 0°C-50°C; Storage Temperature: -4°F to140°F (-20°C to 60°C)
2)Display Resolution: 0.2°F (0.1°C)
3)Accuracy: ±1°F (±0.5°C)
4)Response time:
3. RH Measurement:
1)Range: 0~100%
2)Accuracy: ±5%
3)Resolution: 1% on main reading, 0.1% on Max Min Reading
4)Operating & Storage RH: 0~95% non-condensing
4. Power Requirements: DC5V, 160mA peak,15m average at 5.0V, Power port: Micro USB
5. Dimensions (L x W x D): 4.7 x 3.6 x 1.1inches; 120*91.2*27mm