Monitor 4 & 4EC

Same Monitor 4. New ergonomic design. 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).

Detector
• Monitor 4: Halogen - quenched uncompensated GM tube with thin mica window 1.5 to 2.0 mg/cm2 thick
• Monitor 4EC: Halogen-quenched GM tube, energy compensated sidewall 2 mm tin filter.  Thin mica window 1.5 to 2.0 mg/cm2 thick
• Display: Analog Meter holds full scale in fields as high as 100X max reading
• Operating Range: 0 to 50 mR/hr and 0 to 500, 0 to 5,000, 0 to 50,000 CPM or 0 to 500 μSv/hr

Monitor 4 Energy Sensitivity
• M4: Detects alpha down to 2.5 MeV; typical detection efficiency at 3.6 MeV > 80%.  Detects beta at 50 keV with 35% efficiency.  Detects beta at 150 keV with 75% efficiency. Detects gamma and x-rays down to 10 keV through the window, 40 keV minimum through the sidewall. Normal background is approximately 10 to 20 CPM.
• M4EC: Same as Monitor 4 except the energy response for gamma and x-rays through the detector sidewall is flat within +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.
• Gamma sensitivity: 1000 CPM/mR/hr (ref. to Cs-137)
• Range switch: X1, X10, X100, battery check
• Accuracy: ± 15% of full scale (referenced to Cs-137)
• Audio: internally mounted beeper (can be turned off for silent operation)
• Power requirements: 9 V alkaline battery up to 2,000 hrs at normal background
• Temperature range: -20° C to 55°C (-4°F to 131°F)

Weight
• M4: 223.9 g (7.2 oz) without battery
• M4EC: 245.7 g (7.9 oz) without battery
• Size: 8.25" x 2.75" x 1.875" (210 x 70 x 48 mm)

Includes carrying case with belt clip, observer software and mini-USB cable.

Accessories: SI Meter Option

Warranty: 1 year limited warranty

All meters above come with carrying case. Batteries not included.