Monitor 4 & 4EC

Monitor 4 & 4EC
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Price: $480.00
Product ID : SE-MONITOR 4-4EC


Monitor 4 & 4EC Handheld Radiation
Alert® Detector

The M4 and M4EC are compact, general purpose survey meters capable of detecting alpha, beta, gamma, and x-rays over 3 selectable ranges. A red count light flashes and a beep sounds with each event detected. The Monitor 4EC offers a more linear reading for gamma and x-rays ( above 40 keV).

Monitor 4 is a halogen-quenched uncompensated GM tube with thin mica window 1.5-2.0 mg/cm2 thick.

Monitor 4EC is a halogen-quenched GM tube, energy compensated sidewall 2mm thin filter. Thin mica window 1.5-2.0 mg/cm2 thick. Effective diameter of window is 9.1mm (.36 in.)



Energy Sensitivity:

1000 CPM/mR/hr (referenced to Cs-137) Monitor 4EC is the same as Monitor 4 except the energy response for gamma and x-rays through the detector sidewall is flat withing +61% or -26% over the range of 40 keV to 100 keV, and within +35% or -17% over the range of 100 keV to 1.3 MeV. Both Monitor 4 and Monitor 4EC detect beta at 50 keV with typical 75% detection efficiency.
Operating Range 0-.5, 0-5, 0-50 mR/hr 0-500, 0-5,000, 0-50,000 CPM or 0-5, 0-50, 0-500 µSv/hr (Sievert scale meter option)

Range Switch

X1, X10, X100, Battery Check.


Typically ±15% of reading (referenced to Cs-137)
  • 9 volt alkaline battery approximately 2,000 hours at normal background.
  • Includes carrying case w/belt clip
  • Options: Sievert monitor option, Observer Software, Mini-USB option with USB Oberserver Software
  • Limited 1 year warranty

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