Fluke 451B/451P, Ion-Chamber Survey Meters 16374 Fluke 451B/451P, Ion-Chamber Survey Meters Print 16374 Fluke 451B/451P Ion-Chamber Survey Meters High sensitivity survey meters with ion chamber for radiation leakage, scatter beams, pinholes or very short duration pulse X-rays (Golden X-ray tubes). The 451P (pressurized ion chamber) and the 451B (ion chamber) are both auto-ranging and have very fast response time. NOTE: The 451P has a pressurized ion chamber (125psi) and therefore shall be shipped ground. 451B: Fluke 451B ion chamber survey meter for X-rays, pulse X-rays, Alpha, Beta and Gamma detection. Operating range: 0 µR/h to 50R/h (0 µSv/h to 500 mSv/h). Delivered with calibration certificate and rigid transport case. 451P: Fluke 451P pressurized ion chamber survey meter for X-rays, pulse X-rays, Beta and Gamma detection. Operating range: 0 µSv/h to 50 mSv/h. Delivered with calibration certificate and rigid transport case. Request for information