Monitor 4EC
Monitor 4EC
Monitor 4EC
Monitor 4EC
Monitor 4EC
Monitor 4EC
Monitor 4EC
Monitor 4EC
Monitor 4EC
Monitor 4EC
Monitor 4EC

Monitor 4EC

Specification Of Monitor 4EC

The Monitor 4EC is an energy compensated, ergonomic radiation survey meter 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 linear response for gamma and x-rays (above 40 keV).

Applications & Uses: Checking accelerator & x-ray shielding for leakage, Checking industrial gauges, such as moisture, density, or level gauges containing Cesium-137, Locating sources, Personal protection, General surveying

Analog Radiation Detector Comparison | Contact For Pricing and Availability



radiation_icon_bllack alpha_icon_black beta_icon_black gamma_icon_black x-ray_icon_black

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 9.1 mm (.36 in.).

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 (SI Scale Meter Option)


Energy Sensitivity

1000 CPM/mR/hr (Cs137). Detects alpha down to 2.5 MeV; typical detection efficiency at 3.6 MeV is greater than 80%. Detects beta at 50 keV with typical 35% detection efficiency and beta at 150 keV with typical 75% detection efficiency. Detects gamma and x-rays down to 10 keV typical through the window (non-compensated), 40 keV through the sidewall.

Monitor 4EC Energy Response Graph


Reference to Cs137
Typically ±15% from factory, ±10% with NIST Source Calibration NIST Calibration Additional

Range Switch

X1, X10, X100, Battery Check.


Analog Meter holds full scale in fields as high as 100X maximum reading. CPM & mR/hr scale. Optional SI Scale Meter Available

 Optional meter scales

Audio Indicator

Internally mounted beeper (can be turned off for silent operation).


3.5 mm jack with pulse out.

Power Requirements

9-volt alkaline battery (included). Approx. 2,000 hrs. at normal background

Temperature Range

-10° to +50°C (14° to 122°F)


10% to 70% Non-Condensing.


M4: 200 g (7.1 oz) M4EC: 224 g (7.9 oz)


209 x 71 x 50 mm (8.2 x 2.8 x 1.9 in.)


Carrying Case w/ Belt Clip


SI Meter Option, Observer Software

Limited Warranty

1 year limited warranty

Included with Monitor 4 EC

Carrying Case
Carrying Case