Monitor 4 Monitor 4EC Monitor 5 MC 1K
General purpose Geiger counter. Detects alpha, beta, gamma, and x-rays
Detector:
Halogen-quenched uncompensated GM tube with thin mica window 1.5-2.0 mg/cm2 thick.
Operating Range:
0-50 mR/hr and 0-50,000 CPM, or 0-500 µSv/hr and 0-50 mR/hr. 7/8" x 1 3/4" dual scale analog
Has an energy compensated sensor for detecting gamma or x-rays between 40-100 keV with more accuracy. Includes thin window for some alpha and beta detection

Detector:
Halogen-quenched GM tube, energy compensated sidewall 2mm tin filter. Thin mica window 1.5-2.0 mg/cm2 thick. Approx. 1000 CPM/mR/hr for Cesium 137. Energy compensation is only effective through the sidewall of the GM (refer illustration 1).
Operating Range:
0-50 mR/hr and 0-50,000 CPM, or 0-500 µSv/hr and 0- 50 mR/hr. 7/8" x 1 3/4" dual scale analog meter.

The MONITOR 5 offers greater sensitivity to lower energy radiation.

Detector:
Halogen-quenched uncompensated GM tube with thin mica window 1.5-2.0 mg/cm2 areal density. The diameter of the window is 28.58 mm.
Operating Range:
0-500, 0-5000, 0-50,000 CPM. Each range is independently calibrated. 7/8 in x 1 3/4 in analog meter. Optional tri-scale, 0-12.5, 0-125, 0-1,250 CPS, 0-.5, 0- 5, 0-50 mR/hr, 0-5, 0-50, 0-500 µSv/h
r.

Detects gamma and x-rays above 35 keV only. Detector is energy compensated.

Detector:
Energy compensated halogen-quenched GM tube, no window.
Operating Range:
X1 position (in .05 increments) 0 to 1 mR/hr or 0 to .01 mSv/hr (milli-Sievert per hour)
X10 position (in .5 increments) 0 to 10 mR/hr or 0 to .1 mSv/hr
X100 position (in 5 increments) 0 to 100 mR/hr or 0 to 1 mSv/hr
X1000 position (in 50 increments) 0 to 1000 mR/hr (1R) or 0 to 10 mSv/hr