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 800075 Tube Holder Quad Variable Flow, only Price on request 800681-1 Tube Breaker Kit, Black, LFS-113 Price on request 800072 Tube Holder Single Variable Flow, only Price on request