PRM-9000 Geiger Counter


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2.00 LBS
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Please note that there is an extended lead time on these units.

This PRM-9000 Radiation Monitor is identical in most respects to its forerunner PRM-8000, i.e. a 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.


prm9000pancake.jpgBut the major difference is that the PRM-9000 has been fitted with a large, pancake-style Geiger-Mueller tube.  This is the same ultra-sensitive detector as used in the Inspector line of instruments.

The photo (at right) of the back of the instrument shows the thin mica end window of the GM tube through the protective mesh screen, with a diameter of 45 mm (1.75 in), producing increased efficiency of radioactivity detection, and offering excellent sensitivity to low  levels of Alpha radiation, in addition to normal Beta, Gamma and X-ray detection.

This feature makes the PRM-9000 suitable for applications requiring higher levels of sensitivity such as checking food for radioactive contamination, subject to certain qualifications - click on the above link.

The PRM-9000 is a very high quality, professionally engineered radiation detector Made in the USA.  As a Geiger Counter, instead of a dosimeter, it is capable of providing immediate warning of radiation danger.

prmports.jpgThe PRM-9000 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-9000 also includes an automatic Timed Measurement or Timed Count feature that is necessary to reveal low level contamination that a momentary scan might otherwise miss.

Two ports are built into the PRM-9000, as shown in the photo at left.  The bottom port accommodates an optional A/C Adapter for those who do not want to run on battery power.

The upper port is multi-functional, serving as an Audio jack for earphones, and also as a Data Port which, when connected to an optional Data Cable, enables uploading of previously logged data.  Finally, the data port can be configured for Pulse Output which, in conjunction with optional software, then graphs and records the radiation counts in real time.prmjapdisplay.jpg

Given the need to check radiation levels from the Fukushima plant, the PRM-9000 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 - 125 mR/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-9000 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-9000 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-9000 includes abundant I/O options including support for headphones, external speakers, external power and USB data exchange.

Instruction manual in printed booklet form included.

The price includes the Ballistic Nylon Case.

This item typically ships within 1 business day.


Specifications for the PRM-9000:


Halogen-quenched, pancake-style Geiger-Mueller tube LND 7317 with thin mica end window

Window Size

1.4 to 2.0 mg/cm² thick; diameter is 45 mm (1.75”)

Radiation Detected Alpha, Beta, Gamma, X-ray
Energy Sensitivity Alpha: minimum 2.0 MeV; Beta: minimum 0.16 MeV with 25% efficiency at 1 MeV; Gamma/X rays: min 10 keV (window)
Gamma Sensitivity 3,000 CPM per mR/hr, referenced to Cs-137; Normal background is approximately 30 to 60 CPM


± 10%typical;±15% maximum

Operating Ranges

.001 to 125 mR/hr; .01 to 1,250 µSv/hr; 1 to 125,000 uR/hr; 0 to 300,000 CPM; 0 to 3,000 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

About 28,000 hours or 3.2 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


368 grams (13 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-9000:

Quick Start Manuals:

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

PRM 9000 Quick Start Guide (Japan)

Expanded Users Guide:

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

1 Review Hide Reviews Show Reviews

  • 5
    Mazur PRM 9000 radiation detector.

    Posted by David F. on Feb 8th 2017

    First of all I would like to say that Tim, at was very polite and helpful answering all of my questions. Thanks Tim for your patience, knowledge, and fast shipping. The unit came packaged very well. My first impression of this instrument is that it is very easy to use. The simple buttons access the menu and scrolling thru and making selections is very intuitive. This instrument seems to be very sensitive and picks up changes very quickly. The larger LND 7313 tube is well worth the extra money of the PRM9000.