Geiger-Muller Tube SI-29BG (си29бг).
New, never used.
Tubes come from wholesale box so there might be no original box for single tubes.
Throughly tested.
Tubes are carefully packed for shipping.
Russian made G-M tubes designed to detect betta and gamma rays
Range of registering of gamma radiation = 1*10Е-3 ... 4*10Е1 mk Roentgen/sec
Working Voltage Interval ........... 350-480V
Plateau Length ............. at least 100V
Plateau Inclination ............. 0.125%/V
Length .......... 55 mm
New Old Stock