... choice for handheld applications.GRI-8313 Series Portable O3 Gas Detector is widely used in Electronics ,petroleum ,petrochemical,chemical ,metallurgy ... sensors Can be set high /low alarm point, two levels sound and light alarm.Provide calibration methods of software and ... T90<60SIndicate way: LCD display real-time concentration ,LED , buzzer alarm . Operate environment: --10°C—50°C 15%-95%RH ( ...