hydrogen gas price 1. Fixed type installation 2. Gas detector with lcd display 3. Audible and visual alarm ... and maintenance. * Multi-parameter backlight LCD display: measuring range,digital gas reading ,units, bar graph , system status etc.* International standard ... , %,%LEL,%VOL* Operating temperature: -40~70°C (According to gas sensor operating conditions)* Humidity: 10-95%RH (non condensing)* Ex ...