Specifications:
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 (1.13 inches).

Monitor 5 Energy Sensitivity:

Referenced to Co-60, gamma sensitivity is 25 counts per second per 1 mR/hr.
Recommended I-125 detection is for .5 mCi and up.
Smallest detectable level of I-125 is approx. 0.02 µCi.
Typical detection efficiencies compared to 4 pi counter
Source Energy Efficiency
Sr-90 (.035 µCi) 5.46 keV & 1.2 MeV beta max 18%
Bi-210 (.016 µCi) 1.16 MeV 20%
C-14 (.163 µCi) 156 keV beta max .07%

Operating Range:
0-500, 0-5000, 0-50,000 CPM (single scale)
Optional Tri-scale Meter:
0-12.5, 0-125, 0-1,250 CPS
0-.5, 0-5, 0-50 mR/hr
0-5, 0-50, 0-500 µSv/hr

Anti-Saturation:
Meter will hold at full scale in fields as high as 100 times the maximum reading.
Audio Indicator:
Internally mounted beeper (can be switched off for silent operation). Typical Detection effeciencies compared to 4 pi counter.
Accuracy:
±15% of full scale (referenced to Cs-137)

Range Switch:
X1, X10, X100, Battery Check
Operating Voltage:
7-11 volts DC. High and low voltage fully regulated.
Power Requirements:
One 9-volt alkaline battery. Battery life is up to 2,000 hours at normal background radiation levels.
Temperature Range:
-20° C to 55° C (-4° F to 131° F).
Weight:
240.5 grams (8.5 oz.) without battery.
Size:
145 x 72 x 38 mm (5.7 x 2.8 x 1.5 in.).
Includes:
Carrying Case, 1 year limited warranty and CE mark.
Options:
Observer Software