SBM-20 lot of 100 ,  Geiger counter, Beta & Gamma Detectors. For any Dossimeter, radiometer. NEW (not used). Tested
For sale is lot of 100 new geigers SBM-20 . Tested. With original connectors. Same as on picture. Not used.
I shipp with tracking number, by avia shipping.
My items are always packed carefully.

Technical characteristics:
  
Minimum Anode Resistor                   1.0 (MOhm)
Recommended Anode Resistor           5.1(MOhm)
Recommended Operating Voltage     400V
Operating Voltage Range                   350 – 475V
Initial voltage                                       260 – 320V
Plateau length                                      at least 100 V
Maximum Plateau Slope (%/100 volts)    10
Minimum Dead Time (at U=400V, micro sec)    190
Working range (mkR/s)                      0.004 - 40
Working range (mR/h)                        0.014 - 144
Gamma Sensitivity Ra226 (cps/mR/hr)    29
Gamma Sensitivity Co60 (cps/mR/hr)      22
Inherent counter background (cps)          1
Tube Capacitance (pf)                                4.2
Life (pulses)    at least                                 2*10¹⁰
Weight (grams)                                            9


Gas Filling                    Ne + Br2 + Ar
Cathode Material        Stainless Steel, 50 mkm
Maximum Length        101 mm
Effective Length           83.5 mm
Maximum Diameter    11 mm
Effective Diameter       10 mm
Connector    Pin
Operating Temperature Range  from -60 to +70 C
Areal Density               40(mg/cm²)   
Thickness                      0.05 (mm)

I ship with a tracking number via avia.
If you have any gustions, please contact me.