high precision, high resolution, lifespan can reach to 5 years broad range, the most massive ranges from 0 to 50000ppm or 0 Technical characteristicsl high precision, high resolution, lifespan can reach to 5 yearsl broad range, the most massive ranges from 0 to 50000ppm or 0 ~ 100% Voll Plug and play international standard intelligent sensor, on-site maintenance is very convenientl unique LCD ...