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 800135-10 Tube Holder Collar Clip, for 1/2" OD, 3/8" ID Tubing (Packg of 10) Price on request 200115 Tube Holder Housing, 7 x 130mm, 5/8", L247 Price on request 800258 Single Variable Flow Kit, 7 x 130mm [Dräger Long Term Tubes] Price on request