HL-OZL is an ultrasensitive desktop Ozone gas monitor with 0.01 ppm resolution for monitoring low-level ozone (O3) in the workplace. It has been designed to notify of the presence of low-level O3 gas. HL-OZL has a wide range of applications in industrial, business, home or R&D and other fields. It is important to measure low-concentration ozone accurately.OSHA guidelines state that ozone in the workplace should never exceed 0.10 ppm over an 8-hour day. NIOSH outlines an immediately dangerous to life or health (IDLH) ozone level of 5 ppm or higher. HL-OZL has two alarm set points: High Alarm (O3: 5.00 PPM) and Low Alarm (O3: 1.00 PPM). These set points are factory set and cannot be changed. HL-OZL is equipped with audio and visual alarms to alert users when the ambient gas concentration exceeds one of the two alarm set points. MATERIALS SUPPLIED: 1. HL-OZL desktop low-level ozone gas monitor; 2. Carry case; 3. DC 5V 1.0A adapter; 4. English User Manual. O3 Sensor Specification: 1) Sensor Electrochemical sensor (with temperature compensation); 2) Sample Method Diffusion; 3) Measurement Range 0~10.00 PPM; 4) Resolution 0.01 PPM; 5) Repeatability