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 103SD Sulphur Dioxide 1-60 ppm Gas Detector Tube, pk/10 Price on request 200113 Tube Holder Housing, 7-10 x 110mm, 5/8", L240 Price on request 200104 Tube Holder Housing, 5 x 150mm, 1/2", S255 Price on request