Survey Meter 3.5 X 6.5 X 8.5 Inch, 2100 cpm/mR/hr for Cs-137 Sensitivity, 900 V, 30 mV ᄆ 10 mV Threshold, GM Detectors, Two "D" Batteries, 1.8 X 2.7 X 10.7 Inch Porbe Dimension, Painted Aluminum Probe, 900 V Pancake GM Probe Voltage, 1.75 Inch Pancake GM Probe Window Diameter