Single gas, personal protection monitor that continuously displays toxic gas concentrations. Large, easy-to-read continuous display of gas concentration in ppm. Displays STEL, TWA, and Peak values. Sensors available: H2S, CO, O2, NH3, Cl2, ClO2, HCN, NO, NO2, PH3, SO2. Field replaceable filter and battery. User adjustable high, low, STEL, and TWA alarms. Loud 90 dB buzzer. Built-in vibration alarm. Simple calibration. Durable, highly impact-resistant, carbon loaded ABS housing. Highly resistant to RFI interference. IP-65 rated weather resistant.