UNI-T A37 Carbon Dioxide Monitor

The UNI-T A37 is a compact NDIR-based Carbon Dioxide monitor designed to continuously track indoor air quality. Its LCD interface simultaneously displays CO₂ concentration, temperature, humidity, and date/time, offering a comprehensive view of environmental conditions. The device also uses intuitive emoticons to represent air quality levels at a glance helping users quickly assess whether ventilation is needed.

In operation, the A37 updates CO₂ readings every 3 seconds and triggers both audio and visual alarms including a red backlight when levels exceed approximately 1,000 ppm. Its automatic baseline correction (ABC) feature recalibrates in fresh-air conditions to maintain accuracy and reliability over time.

Designed for practical daily use, its built-in 3.7 V rechargeable Li-ion battery powers over 10 hours of continuous measurement. The monitor includes auto power-off, low battery indication, and a convenient Micro-USB charging port. Lightweight (around 195 g) and compact (75 × 55 × 130 mm), it comes in a protective case and is suitable for diverse indoor settings from offices and schools to homes and vehicles.

Features:

Specifications:

Specifications	Range	Resolution	Accuracy
Carbon dioxide	400ppm~5000ppm	1ppm	±(5%rdg + 50ppm) from 400ppm~2000ppm (at ambient temperature and humidity)
Temperature	-10.0℃~50.0℃	0.1℃	Typical accuracy: ±1℃
Relative humidity	0%RH~99%RH	1%RH	Typical accuracy: ±5%RH (10%RH~90%RH) at 25℃
Features
ABC	Automatic baseline correction		√
Audible and visual alarm			√
Sensor type	NDIR (no-dispersive infrared) CO2 sensor		√
Response time			√
Date/time			√
Low battery indication			√
Auto power off	<2minutes		√
Backlight			√
Operating temperature	0℃~50℃, 0%RH~85%RH		√
Storage temperature	-20℃~60℃, 0%RH~95%RH		√
General Characteristics
Power	3.7V DC Li-ion battery/ Micro USB charging port
Display	42mm x 65mm
Product color	White and grey
Product net weight	195g
Product size	75mm x 55mm x 130mm

Applications:

• Indoor Air Quality (IAQ) Assessment in Offices and Schools.
• HVAC System Ventilation Efficiency Verification.
• Greenhouse and Agricultural Grow Room Climate Control.
• Workplace Safety Monitoring in Confined Spaces.
• Home Environment Health and Comfort Optimization.
• Library and Archive Preservation Environment Monitoring.

Package Contents

• 1x A37 CO₂ Monitor
• 1x Protective case
• 1x USB (Micro-USB) cable
• 1x English user manual

Documents:

• A37 | Flyer
• A37 | User Manual