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LUDLUM M-3 SURVEY METER W/44-2 Ludlum Get Quote



The Model 3 is a portable radiation survey instrument with four linear ranges used in combination with exposure rate, or cpm meter dials. The instrument features a regulated high-voltage power supply, unimorph speaker with audio ON/OFF capability, fast-slow meter response, meter reset button and six-position switch for selecting battery check or scale multiples of Xo.1,X1,X10 and X100. Each range multiplier has its own calibration potentiometer.

Key Features

  • Gamma Radiation survey.
  • NIST-traceable certificate of calibration.

Technical Specifications

Scintillator 1\" diameter x 1\" thick sodium iodide
Range 60 keV to 1.25 MeV
Sensitivity Typically 175 cpm/ µR/ hr (137 Cs gamma)
Operating Voltage 500 to 1200 volts
Dimensions 2\" diameter x 7.3\" long
Weight 1 lb.
Multipliers Xo.1, X1, X10, X100
Audio Built-in unimorph speaker with ON/OFF switch (greater tha 60dB at 2 feet)
Threshold Fixed at 30 mV +/-10 mV
Response Fast (4 seconds) or Slow (22 seconds) from 10 to 8=90% of final reading.


  US Metric
Dimensions 6.5 x 8.5\" x 3.5\"\" 16.5 x 21.6 x 8.9 cm


  US Metric
Weight 3 lbs 1.36 kg