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Detector
Halogen-quenched GM tube with mica end window. Mica window density 1.5-2.0 mg/cm2. Effective window diameter is .360 inch. Side wall is .012 inch thick.
Display
4-digit liquid crystal display with mode indicators. Display updates every 60 sec.
Count Light
Red LED flashes with each count.
Audio Indicator
Sounds with each count (can be switched off for silent operation).
Alert
Pulsating beeper sounds the alert. Three separate adjustable alert levels are used for mR/hr, CPM, µSv/hr:, and Total.
Outputs
Dual miniature jack sends counts to CMOS- compatible devices, including computers, data loggers, and educational data collection systems. Submini jack provides audio output to an external earpiece, amplifier, or tape recorder.

Anti-Saturation
Readout will hold at full scale in high radiation fields as high as 100 times the maximum reading.
Power
One 9-volt alkaline battery.
Battery Life
Battery life is typically 2000 hours at normal background radiation levels.
Temperature Range
-10° to +50°C (14° to 122° F)
Weight
117 grams (6.5 oz.) without battery.
Size
150 x 80 x 30 mm (5.9 x 3.3 x 1.2 in.).