Gamma Sensitivity: Operating Range 1000 CPM/mR/hr (referenced to Cs-137) Energy Sensitivity for the 4EC is the 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. 0-.5, 0-5, 0-50 mR/hr 0-500, 0-5,000, 0-50,000 CPM or 0-500 µSv/hr 0-50 mR/hr. Range Switch X1, X10, X100, Battery Check. Accuracy Typically ±15% of reading (referenced to Cs-137) Audio Internally mounted beeper (can be turned off for silent operation). Power Requirements 9-volt 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 grams (7.9 oz) without battery M4EC: 245.7 grams (8.7 oz) without battery Outputs 3.5 mm headphone jack with pulse out. Size 210 x 70 x 48 mm (8.25 x 2.75 x 1.875 in.) Accessories Carrying Case, Observer Software, USB Option, SI Meter Option Warranty 1 year limited warranty
