PRM-7000 Geiger Counter

Handheld Beta, Gamma, X-Ray Geiger Counter and Nuclear Radiation Monitor

The compellingly priced PRM-7000 Geiger counter, shown here,  provides essential,  professional-grade nuclear preparedness and radiation measurement during nuclear accidents, incidents or emergencies.
PRM-7000 Geiger Counter

The compellingly priced PRM-7000 Geiger counter provides essential, professional-grade nuclear preparedness and radiation measurement during nuclear accidents, incidents or emergencies.

The instrument is designed to similar specifications as devices used by firefighters, HAZMAT teams, paramedics and other first responders to address the radiation hazards they face. If your application is nuclear preparedness, the PRM-7000 is a compelling option.

The PRM-7000 is built upon the same long battery life, high quality, made in the US, platform as the PRM-8000 and PRM-9000, which have been the choice of governments, organizations and individuals around the world.

Unlike other instruments in this price range, the PRM-7000 can be calibrated to the official international standards of accuracy required for regulatory work. An actual NIST-traceable calibration report example can be reviewed here.

Note, while the PRM-7000 is an outstanding choice for environmental measurement, it not the best choice for testing food. Please consider the PRM-9000. The PRM-9000 is 7.7 times more sensitive than the PRM-7000 to gamma nuclear radiation and is best for detecting lower levels of contamination in items quickly. No Geiger counter is exceptional for detecting trace contamination in food, but the PRM-9000, with its pancake tube is the better of the two for scanning food.

Mazur Instruments uses only genuine detector tubes, made in the US, by LND in all of its products and does not rely on imported, cloned or “knock-off” detector tubes present in some lower priced products. Accurate, reliable, made in the USA, the PRM-7000 Geiger counter is an ideal solution for organizations, individuals, health physics professionals, educators, researchers, outdoor enthusiasts and rock collectors.

24/7 Monitoring Capability

The instrument is designed to continuously collect measurements and statistics enabling complete environment assessment in order to support its nuclear preparedness mission objectives. This vital capability is typically not available on similarly priced products. 

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-7000 Geiger counter not only records the maximum radiation measured, but also displays the time and date at which the maximum reading occurred. Conventional Geiger counters require the user to be looking at the radiation meter to capture such events.

Industry Leading Battery Life

The battery life of this radiation detector and monitor is over 6-years under normal conditions from a single, readily available, 9-volt lithium battery that is user-installable without soldering. The supplied standard alkaline 9-volt batteries, available virtually everywhere supportting nuclear preparedness, provide over 3-years of life under normal conditions.

Data Logging and USB Connectivity

With over 100K bytes of internal data logging memory included, this Geiger counter can autonomously (without the need for a PC) store up to 91,466 minutes or hours of time-stamped measurements. These measurements can then be uploaded later to a PC in CSV format for analysis.

Made in the USA

Designed by Mazur Instruments and manufactured in the USA, the PRM-7000 Geiger counter and nuclear radiation monitor includes abundant I/O options including support for headphones, external speakers, external power and USB data exchange (Requires Optional 3.5mm to USB Adapter Cable).

PRM-7000 General Purpose Geiger Counter

Battery Life1 
Standard 9V Lithium60,000 Hours / 6.85 Years
Standard 9V Alkaline28,250 Hours / 3.22 Years (included)
Measurement Front End 
DetectorLND 713 Geiger-Muller tube, Halogen-quenched Thin Wall Beta-Gamma Detector (Made in The USA)
Radiation Detectedbeta, gamma and x-radiation
Energy Sensitivitybeta / gamma / X-rays: min 35 keV

gamma sensitivity: 450 CPM/mR/hr
calibrated to Cesium-137 (Cs137)
Accuracy±10% Typical, ±15% Maximum
Measurement Ranges0.001 to 500 mR/hr
0.01 to 5,000 uSv/hr
1 to 500,000 uR/hr
1 to 225,000 CPM (450 CPM/mR/hr)
0 to 3,750 CPS (7.5 CPS/mR/hr)
Total Count: 0 to 4,294,967,295 (32 Bit Integer)
Measurement StatisticsContinuous availability of Elapsed Time, Average, Minimum and Maximum dose rate in either uR/hr, mR/hr, uSv/hr, CPS or CPM

Time stamp on new maximum
Timed MeasurementSelectable 1, 5, 10, 20, 30, 60 and 90 minute interval
Dose Rate AlarmAlarm can be set in mR/hr or uSv/hr to any value within the measurement range
Internal Data Logging 
Storage100,000 Bytes non-volatile memory
Logging IntervalsEvery Minute or Every Hour
Maximum Capacity91,466 Minutes or Hours
(90% Normal Background, 10% Full-Scale)
Minimum Capacity32,656 Minutes or Hours
(100% Full-Scale Measurement Levels)
Logging Output FormatStandard Comma Separated Value (CSV) with time stamp and CPM Data (1,000 CPM/mR/hr)
User Interface 
Languages SupportedEnglish and Japanese
DisplayTwo-Line, 14 character transflective LCD with back light for low light conditions
KeypadWeather resistant commercial-grade membrane keypad
Visual IndicatorLED pulses on and off when a radiation detection event occurs. LED can be disabled.
Audio IndicatorTone beeps when a radiation detection event occurs. Audio three volume levels and can be muted.
Input / Output 
Audio Output / Digital InterfaceStandard 3.5mm jack with three selectable volume levels for output to audio systems, computer speakers or media player headphones.

Jack can also be provisioned by the user for pulse output or as a USB Interface for logging data by PC or transferring internal data logging memory (requires optional cable)
External Power9 VDC at a minimum current rating of 100mA
Environmental / Physical 
Temperature Range-20° to 51° C (-4° to 125° F)
Size143 x 83 x 35 mm (5.63″ x 3.25″ x 1.37″)
Weight261 grams (9.2 oz.) including battery
ComplianceCE, Lead-Free

Independently tested and found to be substantially compliant with FCC requirements for home use. Approval to display FCC logo pending.
 One Year (120 Days on GM Tube)


    1. Assuming that background radiation is less than 25 CPM, the device is using the low-power setting and temperature of operation is 25° C (77° F).

All specifications are subject to change without notice.

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