Go-Cal Replacent Filter Back Catalog number: 811-9917-01 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 360-0138-01 Operation Manual/Software CD for Nephelometer, TSP Price on request 800217 Impinger, Moisture Trap, Plastic, with 1/4" ID tub Price on request 800093-3 Inlet Filter Replacement Kit, LFS-113 (Packg of 3) Price on request