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 800259 Single Tube Holder Kit, 7-10 x 110mm Price on request 200524 Tube Holder Tubing, 3/16" ID x 1/16" W (10 ft) Price on request 106SC Carbon Monoxide 1-50 ppm Gas Detector Tube, pk/10 Price on request