Description 0 Reviews Gastec Benzene Gas Detector Tubes. Options: Benzene (C6H6) Gas Detector Tubes Detection Range: 2.5-120 ppm 10 tubes, 10 tests per boxP/N 121 Benzene (C6H6) Gas Detector TubesDetection Range: 0.2-66 ppm5 detector tubes, 5 pre tubes per box P/N 121SP Benzene (C6H6) Gas Detector TubesDetection Range: 0.1-65ppm5 detector tubes, 5 pre tubes per box P/N 121L Benzene (C6H6) Gas Detector TubesDetection Range: 1-100 ppm5 detector tubes, 5 pre tubes per box P/N 121SL Benzene (C6H6) Gas Detector TubesDetection Range: 2-312 ppm5 detector tubes, 5 pre tubes per box P/N 121S Write a Review 0 Reviews Hide Reviews Show Reviews