Ozone Monitor provides fast and continuous response. It is rugged and versatile. There is no touchy control. It is perfect for water treatment plants, pulp bleaching mills, ozone generator monitors, photocopier and laser printer centers, fumigation projects, HVAC and indoor air quality systems, vehicular pollution monitors, research labs and pilot plants and wherever ozone exposure is possible. It constantly monitors the work environment. It shows the situation by a multicolor graphical display and alarms. It is easily understood by non-technical personnel. It feature includes LED readout changes color as ozone level increases, audio alarm and output for data logger. Connections for external equipment control. It has general monitoring and ozonator control. It features a heated metal oxide semiconductor (HMOS) sensor for excellent sensitivity and quick response time.