(1) long life (KE-25-5 years) 
 (2) is not CO2, CO, H2S, NOx, H2 of 
 (4) work at room temperature 
 (5) No external power supply 
 (6) measuring range 0-100% 
 (7) Accuracy ± 1% (full scale); 
 (8) Operating Temperature 5 ~ 40 ℃ 
 (9) Storage temperature -20 ~ +60 ℃ 
 (10) response time of 14 ± 2 秒 
 (11) initial output 10.0-15.5mv;