COUNTER; TYPE: GEIGER PORTABLE; WORKING RANGE: 0.001-125MR H, 0.01-1250USV H, 1-125000UR H, 1-437500CPM (3500CPM MR H), 0-7291CPS (58.33CPS MR H), TOTAL RECUIT: 0-4294967295 (32 WHOLE BITS); VOLTAGE (V): 9VDC; CURRENT (A): 100MA; OPERATING TEMPERATURE: -2 0 TO 51°C (-4 TO 125°F); DIMENSIONS: 143X83X35MM (5.63X3.25X1.37”); ADDITIONAL FEATURES: INCLUDES 2” (50.8 MM) PANIC DETECTOR TUBE WHICH IS THE GOLD STANDARD FOR RADIATION STUDIES; SUGGESTED BRANDS: MAZUR INSTRUMENTS PRM-9000