... maintenance. * Multi-parameter backlight LCD display: measuring range,digital gas reading ,units, bar graph , system status etc.* International standard ... : backlight LCD, LED* Backlight 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 ...