KWIK DRAW Semiconductor Set I, 12 tubes in box, 12 month shelf life

KWIK DRAW n-Butyl Mercaptan, 1.5-15 ppm, t-Butyl Mercaptan, 0.8-5 ppm, Ethyl Mercaptan 0.5-80 ppm, Isopropyl Mercaptan 0.5-5.5 ppm, Mercaptans 0.5-100 ppm, Methyl Mercapan 0.5-5 ppm, n-Propyl Mercaptan, 0.7-8 ppm Detector Tubes, 10 per box, 24 month shelf life