Filter Cassette Holder Kit (required when sampling with Cassette) Back Catalog number: 800143 Manufacturer: SENSIDYNE Availability: 3 weeks Price on request - + Recommended 811-9917-04 Go-Cal Carrying Case, Soft Price on request GF25TQ Filter, Tissue Quartz, (99.90% retention of 0.3µm DOP) 25mm, 100/Pack Price on request 811-0905-01-R Inlet Filters, Replacement for GilAir Plus, Pack of 10 Price on request