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Yellow handheld radiation survey meter with LCD backlit display and rubberised grip

Fluke

Fluke 451P-RYR pressurized ion chamber survey meter measurement tool

SKU CH-8R3D-ET8SD

Measures ionising radiation with a pressurised ion chamber, LCD backlight, NIST calibration and 100-hour alkaline battery life

  • TypeDigital Multimeters
  • Pressurized ion chamber delivers accurate radiation surveys
  • LCD backlight provides clear readings in low light
  • NIST calibration certificate ensures traceable measurement confidence
  • 100-hour alkaline battery life supports extended field use
  • Measures up to 500 uSv/hr across multiple dose-rate units

Radiation survey meter for health physics

The Fluke 451P-RYR is a pressurized ion chamber survey meter built for health physics and radiation safety professionals. It measures dose rates from 0 to 500 uSv/hr with beta energy sensitivity down to 1 keV. A backlit LCD provides clear digital readouts in multiple units including mR/hr and uSv/hr. The instrument arrives new with a NIST calibration certificate.

Two 9 V alkaline batteries included

Two 9 V alkaline batteries are supplied in the box, removing the need to source power before first use. Alkaline chemistry delivers a 100 hour run time for extended field surveys. The meter powers directly from these cells without an external adapter or charging cradle. Battery status is visible on the digital display during operation.

Covers low background to 500 uSv/hr

The meter comfortably handles environmental background checks and routine area monitoring up to its 500 uSv/hr maximum. It resolves dose rates down to zero, making it suitable for verification of shielding effectiveness. Scenarios exceeding the upper limit or requiring isotope identification fall outside its measurement capability.

Highlights

  • Pressurized ion chamber delivers accurate radiation surveys
  • LCD backlight provides clear readings in low light
  • NIST calibration certificate ensures traceable measurement confidence
  • 100-hour alkaline battery life supports extended field use
  • Measures up to 500 uSv/hr across multiple dose-rate units

Specifications

BrandFLUKE BIOMEDICAL
TypeDigital Multimeters

Questions about this item

How often will the two 9V alkaline batteries need replacing during continuous use?

Each set provides about 100 hours of operation, so replacement frequency depends on daily usage hours.

What is the highest dose rate the 451P-RYR can measure before reaching its limit?

The meter tops out at 500 uSv/hr, which is the first constraint under sustained high-field exposure.

Does the LCD backlight or ion-chamber electronics generate noticeable heat or fan noise during all-day surveys?

The unit has no fan and the low-power LCD plus ion chamber produce negligible heat, so it runs silently.

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