Phosphine detection tube 7 LA Phosphine PH3，Measuring Range 0.05 to 0.1 ppm 0.1 to 1.5 ppm 1.5 to 2.5 ppm 2.5 to 9.8 ppm， Emergency detection boxes for public places, targeted preparation of rapid detection instruments and equipment for toxic substances such as gas detectors, gas detectors, chemical rapid detection boxes, etc., sampling equipment such as air samplers, gas bags, sampling bottles, and simple water quality detection boxes for sample storage and transportation