PRM-8000 Geiger Counter


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PRM-8000 Digital Pocket Geiger Counter

Designed to detect Alpha, Beta, Gamma, and X-Radiation, displaying through a digital readout, and emitting an audible click with each radiation count detected.

This is a very high quality, professionally engineered and built pocket-sized radiation detector Made in the USA.  The PRM-8000 is not just another dosimeter rushed to the market to take advantage of the recent crisis - it is thoroughly tested, and as a Geiger Counter, instead of a dosimeter, it is designed to provide immediate warning of radiation danger.

Tprmendwindow.jpghe photo at right shows the thin mica end window of the PRM-8000 available at the top of the instrument, enabling the detection of alpha radiation which, if ingested, can be potentially dangerous.

The PRM-8000 is designed to be "Always On" at the user's option, and in that state, continuously monitors Current, Average, Maximum and Minimum Radiation Levels.  This powered mode is made possible by an ultra-efficient hardware and software design that gives an incredible 3 year battery life, yet from a standard 9V alkaline battery.

The PRM-8000 includes an automatic Timed Measurement or Timed Count feature that is necessary to reveal low level contamination, that might otherwise be missed from a momentary scan. 

Given the need to check radiation levels from the Fukushima plant, the PRM-8000 display can be converted from English to Japanese language characters (see example at left).

Other Features:   

Two-line, alpha-numeric display with backlight to support low-light conditions

Display Units - uR/hr, mR/hr, uSv/hr, CPS and CPM

0.001 - 200mR/hr Range

The device's unique Radiation Monitoring Engine (RME) is always-on collecting measurements enabling rapid environment assessment.

Using only one key, users can scroll through several screens that display present, average, maximum and minimum measurements in uR/hr, mR/hr, uSv/hr, Counts per Second (CPS) or Counts per Minute (CPM).

The PRM-8000 instrument not only records the maximum radiation measured, but also displays the time and date at which the maximum occurred.

Visual and audible Indicators, including flashing LED with each radiation count

A user-settable dose rate alarm sounds an audible alert when the measured radiation level exceeds that of the alarm level setting.

With over 100K bytes of data logging memory included, the PRM-8000 can autonomously store up to 91,466 minutes or hours of time - stamped measurements. These measurements can then be uploaded to a PC in industry standard CSV format for analysis.  Optional USB cable available.

Designed by Mazur Instruments and manufactured in the USA, the PRM-8000 includes abundant I/O options including support for headphones, external speakers, external power and USB data exchange.

Instruction manual in booklet form included.

prmcase.jpgThe price includes the Carrying Case shown at right (cable optional).

This item typically ships within 1 business day.




Specifications for the PRM-8000:


Halogen-quenched, long thin cylindrical Geiger-Mueller tube (LND712) with side wall of .012" #446 stainless steel, and with thin mica end window

Window Size

1.5 to 2.0 mg/cm² thick;

Radiation Detected Alpha, Beta, Gamma, X-ray
Sensitivity 1,000 CPM per mR/hr, referenced to Cs-137; Normal background is approximately 10 to 20 CPM


± 10%typical;±15% maximum

Operating Ranges

.001 to 200 mR/hr; .01 to 2,000 µSv/hr; 1 to 200,000 uR/hr or CPM; 0 to 3,333       CPS; Total from 1 to 4,294,967,295 counts

Anti-Saturation Both hardware and software anti-saturation methods deployed
Measurement Statistics Continuous availability of Elapsed Time, Average, Minimum and Maximum Dose Rate in either uR/hr, mR/hr, uSv/hr, CPM, or CPS; Time and Date Stamp of Maximum occurrence
Timed Measures Selectable 1, 5, 10, 20, 30, 60, 90 minute intervals
Indicators LCD display, red LED count light, audible beeper for count rate at 3 volume levels, mutable, audible alert
Display 2 line, 14 character transflective Liquid Crystal Display with Backlight for low light conditions
Languages English and Japanese
Count Light Red LED flashes with each count
Beeper Chirp for each count, 3 volume levels (can be muted)
Alert User-adjustable alert level can be set in mR/hr or uSv/hr to any value within the measurement range - set using three buttons
Keypad Weather-resistant commercial-grade membrane keypad
Data Logging Internal storage of 100,000 Bytes non-volatile memory
Logging Intervals Every Minute or every Hour
Maximum Logging 91,466 Minutes or Hours
Minimum Logging 32,656 Minutes or Hours
Logging Output Standard Comma Separated Value (CSV) format, with Time Stamp and CPM Data


Calibrated to a Cesium 137 standard

Temperatur Range -20 deg. to 51 deg. C, -4 deg. to 125 deg. F

Power Required

9V alkaline battery (included in price of the unit)

Battery Life

,000 years at normal background radiation levels of less than 25 CPM

Optional Battery 9V Lithium battery giving 60,000 hours or 6.8 year life
External Power 9V DC at a minimum current rating of 100mA


198 grams (7 oz.) including battery


143 x 83 x 35 mm (5.6 x 3.3 x 1.4 in.)

Audio Output / Digital Interface Standard 3.5mm jack with 3 selectable volume levels for output to audio devices.  Jack can also send pulse output or function as a USB interface for logging data by PC or transferring internal data logging memory (requires optional cable)
Options Computer cable and software (See Software)
Warranty One year limited on instrument, 120 days on Geiger-Mueller tube
Compliance Includes CE mark, lead-free

Country of Make



Click on the links below to download Operating Manuals for the PRM-8000:

Quick Start Manuals:

PRM-7000, 8000, 9000 Quick Start Guide (English)

PRM-8000 Quick Start Guide (Japanese)

Expanded Users Guide:

PRM-7000, 8000, 9000 Users Guide (English)