... of gas)ModelInstrument descriptionTGas-1021-CO-1000CO detector (range: 0-1000ppm) ex-factory setting current low ... , high point 500TGas-1021-H2S-100H2S detector (range: 0-100ppm) ex-factory setting current low ... , high point 100TGas-1021-SO2-100SO2 detector (range: 0-100ppm) ex-factory setting current low ... , high point 100TGas-1021-NH3-100NH3 detector (range: 0-100ppm) ex-factory setting current low ...