Filter, 37mm, 0.4µm, Polycarbonate, Plain White, 1 Back Catalog number: GFPC4537 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 780-0015-04-R Calibrator cable (BIOS Defender 510-M), for automa Price on request 811-9917-03 Go-Cal Replacent Battery Pack Price on request 783-0018-01 Battery Pack, Gilian 12 (NiMH) Price on request