Formaldehyde 0.05-4.0 ppm Gas Detector Tube, pk/10 Back Catalog number: 171SC Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 111U Isopropyl & Ethyl Acetate (10-1000 ppm) Gas detector tubes, pk/10 Price on request 158S Sensidyne Gas Detector Tubes, Styrene (2.5-300 ppm), pk/10 Price on request 800261 Single Tube Holder Kit, 7-10 x 175mm Price on request