Ludlum Model 5 Geiger Counter

The Ludlum Model 5 Geiger Counter includes Two Built-In Energy Compensated G-M Detectors , 5 Ranges, and  built-In Audio. The range of the Model 5 is 0 - 2000 mR/hr.

Digital Geiger Counters also available.


INDICATED USE: Gamma survey
DETECTORS: Two internal energy compensated G-M tubes
ENERGY RESPONSE: Within plus or minus 15% of true value from 60 keV - 3 MeV
SATURATION: In excess of 1000 R/hr
METER DIAL: 0 - 2 mR/hr, BAT TEST (others available)
MULTIPLIERS: X0.1, X1, X10, X100, X1000
LINEARITY: Reading within plus or minus 10% of true value with detector connected
AUDIO: Built in unimorph speaker with ON/OFF switch (greater than 60 dB at 2 feet )
CALIBRATION CONTROLS: Accessible from front of instrument (protective cover provided )
HIGH VOLTAGE: Adjustable from 200 - 1500 volts
THRESHOLD: 30 mV plus or minus 10 mV
RESPONSE: Toggle switch for FAST (4 seconds) or SLOW (22 seconds) from 10% to 90% of final reading
RESET: Push-button to zero meter
POWER: 2 each "D" cell batteries (housed in sealed compartment that is externally accessible )
BATTERY LIFE: Typically 600 hours with alkaline batteries (battery condition can be checked on meter )
METER: 2.5" (6.4 cm) arc, 1 mA analog type
CONSTRUCTION: Cast and drawn aluminum with beige polyurethane enamel paint
TEMPERATURE RANGE: -4° F(-20° C) to 122° F(50° C)
May be certified for operation from -40° F(-40° C) to 150° F(65° C)
SIZE: 9.5"(24.1cm)H X 3.5"(8.9cm)W X 8.5"(21.6cm)L
WEIGHT: 4.4 lbs (2 kg) including batteries and detector

Common Meter Dial

0 - 2 mR/hr




Replacement Parts

Check Source
Shoulder Strap
Standard Carrying Case
Air and Water Tight Carrying Case

Meter Bezel
Meter Movement





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