... :backlight LCD, LED 3)Unit:ppm, mA, %,%LEL,%VOL 4)Humidity:10-95%RH CO2 gas detector Technical features* 4-20mA, 3 wire connection ,compatible ... LCD display : 5-digit gas reading 50 bar graph display 0-100% full scale* Unit: ppm, mA, %,%LEL,%VOL* Operating temperature ... : -40~70°C (According to gas sensor operating conditions)* Humidity: 10-95%RH (non condensing)* Ex-protection: Exd IIC T6 (Flame ...