ventilation fans
tsi alnor 7525 indoor air quality tester co2 0 to 5000
indoor air quality tester carbon dioxide concentration 0 to 5000 ppm temp range 32 to 140 f relative humidity range 5 to 95 % resolution co2 1 ppm display multiline lcd includes batteries and instructions br b features b ul li accuracy co2 3 % of reading or 50 ppm li li includes batteries and instructions li li item indoor air quality tester li li temp . range 32 to 140 f li li display multiline lcd li li power source 4 aa batteries or ac adapter li li relative humidity range 5 to 95 % li li resolution co2 1 ppm li li manufacturers warranty length 1 year li li humidity accuracy 3 % li li data storage 30000 data points li li carbon dioxide concentration 0 to 5000 ppm li ul